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x in (-oo:+oo)
6*x+6 = 3*x+15 // - 3*x+15
6*x-(3*x)-15+6 = 0
6*x-3*x-15+6 = 0
3*x-9 = 0 // + 9
3*x = 9 // : 3
x = 9/3
x = 3
x = 3
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