Explicación paso a paso:
x^2 + 4x = 7x
x^2 = 7x - 4x
x^2 = 3x
x^2 - 3x = 0
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Explicación paso a paso:
x^2 + 4x = 7x
x^2 = 7x - 4x
x^2 = 3x
x^2 - 3x = 0