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a in (-oo:+oo)
-(3*a)-4 = -34 // + 34
34-(3*a)-4 = 0
34-3*a-4 = 0
30-3*a = 0 // - 30
-3*a = -30 // : -3
a = -30/(-3)
a = 10
a = 10
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