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b in (-oo:+oo)
7*b-(2*b)+10 = -45 // + 45
7*b-(2*b)+10+45 = 0
7*b-2*b+10+45 = 0
5*b+55 = 0 // - 55
5*b = -55 // : 5
b = -55/5
b = -11
b = -11
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