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a in (-oo:+oo)
-(3*a)-1 = -34 // + 34
34-(3*a)-1 = 0
34-3*a-1 = 0
33-3*a = 0 // - 33
-3*a = -33 // : -3
a = -33/(-3)
a = 11
a = 11
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