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3/4x - 3 = x + 4
3/4x - 3 - 4 - x = 0
3/4x - 7 - x = 0
3/4x - x = 7
-1/4x = 7
(- 4)( -1/4x) = 7(-4) --->multiplica por el recíproco
X= -28
3x-4x=16+12
-x=28
x=-28