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a in (-oo:+oo)
-(3*a)-1 = -4 // + 4
4-(3*a)-1 = 0
4-3*a-1 = 0
3-3*a = 0 // - 3
-3*a = -3 // : -3
a = -3/(-3)
a = 1
a = 1
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