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a in (-oo:+oo)
6*a+6 = 3*a+18 // - 3*a+18
6*a-(3*a)-18+6 = 0
6*a-3*a-18+6 = 0
3*a-12 = 0 // + 12
3*a = 12 // : 3
a = 12/3
a = 4
a = 4
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