Explicación paso a paso:
3x + 7 - 5x = 7 + x -12 - 7x + 1
-2x + 7 = -4 - 6x
6x - 2x = - 8 -
4x = - 12
x = -12/4
x = - 3
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Explicación paso a paso:
3x + 7 - 5x = 7 + x -12 - 7x + 1
-2x + 7 = -4 - 6x
6x - 2x = - 8 -
4x = - 12
x = -12/4
x = - 3