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b in (-oo:+oo)
-(3*b)-4 = -7 // + 7
7-(3*b)-4 = 0
7-3*b-4 = 0
3-3*b = 0 // - 3
-3*b = -3 // : -3
b = -3/(-3)
b = 1
b = 1
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