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a in (-oo:+oo)
3*a+6 = 5*a-18 // - 5*a-18
3*a-(5*a)+6+18 = 0
3*a-5*a+6+18 = 0
24-2*a = 0 // - 24
-2*a = -24 // : -2
a = -24/(-2)
a = 12
a = 12
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