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a in (-oo:+oo)
3*(-1*a-6) = -18 // + 18
3*(-1*a-6)+18 = 0
3*(-a-6)+18 = 0
3*(-a-6)+18 = 0
-3*a = 0
-3*a = 0
-3*a = 0 // : -3
a = 0
a = 0
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