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12 - 14
14x= 12(x+3)
14x= 12x+36
14x-12x= 36
2x=36 / :2
x = 18
x/12=(x+3)/(12+2)
x/12=x/14+3/14
x/12-x/14=3/14/*12
x-12x/14=36/14*14
14x-12x=36
x=18