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b in (-oo:+oo)
-(2*b)-2 = 5*b+75 // - 5*b+75
-(2*b)-(5*b)-75-2 = 0
-2*b-5*b-75-2 = 0
-7*b-77 = 0 // + 77
-7*b = 77 // : -7
b = 77/(-7)
b = -11
b = -11
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