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x=18
espero que te ayude mucho
3(4x+7) = 4x-25
12x+21 = 4x-25
12x-4x = -25-21
8x = -46
x= -46/8
2)
7x+15=3(3x-7)
7x+15= 9x-21
7x-9x= -21-15
-2x = -36
x= 36/2
x= 18