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8x-9x+15=12x-180
-x+15=12x-180
13x= 195
x=195/13
x= 15
4 ( 2x ) - 3 ( 3x - 5 ) = 12x - 180
8x - 9x + 15 = 12x - 180
- x - 12x = - 180 - 15
-13x = - 195
x = -195/-13
x = 15 → Solución