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6x +30 -5x = 25
x =25-30
x= -5
b) 5 (x-3) = 4 (x + 4)
5x-15=4x+16
5x-4x=16+15
x=31
c) 3 ( 3 - x) + 9 = 2 ( x - 4) + 6
9 - 3x + 9 = 2x - 8 + 6
3x-2x=-8 + 6 - 9 -9
x= -20
d) - 3 (4 + x) = 5 / x + 4) + 1 - 3x
ese parentesis despues del 4 donde abre?
6x + 30 - 5x = 25
x + 30 = 25
x = 25 - 30
x = -5