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5x-18+12x+60=4(x-1)
5x+12x-18+60=4(x-1)
17x-42=4(x-1)
17x=4+42
17x=78
17x:17=78:17
x=4,50888
5x-30+15-3x+15=4x-4
5x-3x-30+15+15=4x-4
2x=4x-4
4=4x-2x
4=2x
2=x