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b in (-oo:+oo)
-5 = 7*b+5*b-8 // - 7*b+5*b-8
8-(7*b)-(5*b)-5 = 0
8-7*b-5*b-5 = 0
3-12*b = 0 // - 3
-12*b = -3 // : -12
b = -3/(-12)
b = 1/4
b = 1/4
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