[013]Text: Transform

        eq = TexMobject("a^2", "+", "b^2", "=", "c^2")
        eq.save_state()

        self.add(eq)
        self.play(
            eq[0].become,TexMobject("3^2").move_to(eq[0]),
            eq[2].become,TexMobject("4^2").move_to(eq[2]),
            eq[4].become,TexMobject("5^2").move_to(eq[4]),
            run_time=2,
        )
        self.wait()

        eq.restore()
        self.add()
        self.play(
            Transform(eq[0], TexMobject("3^2").move_to(eq[0])),
            Transform(eq[2], TexMobject("4^2").move_to(eq[2])),
            Transform(eq[4], TexMobject("5^2").move_to(eq[4])),
            run_time=2,
        )
        self.wait()

        eq.restore()
        self.add()
        self.play(
            Succession(
            Transform(eq[0], TexMobject("3^2").move_to(eq[0])),
            Transform(eq[2], TexMobject("4^2").move_to(eq[2])),
            Transform(eq[4], TexMobject("5^2").move_to(eq[4])),
            ),
            run_time=2,
        )
        self.wait(3)

 

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class TextEqTest(Scene):
    def construct(self):
        self.method_a()
        # self.method_b()

    def method_a(self):
        eq1 = ['a', '=', 'b', '+', 'e']
        eq2 = ['a', '=', 'c + d', '+', 'e']  # since b=c+d

        t1 = VGroup(*[TexMobject(eq) for eq in eq1]).arrange(RIGHT, buff=0.2)
        t2 = VGroup(*[TexMobject(eq) for eq in eq2]).arrange(RIGHT, buff=0.2)
        t2.next_to(t1, DOWN)

        t1[2].set_color(RED) #b
        t2[2].set_color(RED) #c+d

        self.play(Write(t1), run_time=2)
        self.play(LaggedStart(
            TransformFromCopy(t1[0], t2[0]),
            TransformFromCopy(t1[1], t2[1]),
            TransformFromCopy(t1[2], t2[2]),
            TransformFromCopy(t1[3], t2[3]),
            TransformFromCopy(t1[4], t2[4]),
            lag_ratio=0.9,
            run_time=5,
        ))
        self.wait()