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a in (-oo:+oo)
-(6*a)-4 = -22 // + 22
22-(6*a)-4 = 0
22-6*a-4 = 0
18-6*a = 0 // - 18
-6*a = -18 // : -6
a = -18/(-6)
a = 3
a = 3
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