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a in (-oo:+oo)
-(4*a)-10 = -18 // + 18
18-(4*a)-10 = 0
18-4*a-10 = 0
8-4*a = 0 // - 8
-4*a = -8 // : -4
a = -8/(-4)
a = 2
a = 2
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