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3x-15+7=x+1
3x-x=1+15-7
2x=9
x=4,5
3x-15+7=x+1 /-x /+15 /-7
3x-x=1-7+15
2x=9 /;2
x=4,5
3x-15+7=x+1 |-x
2x-15+7=1 |-7
2x-15=-6 |+15
2x=9 |: 2
x= 4,5