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b in (-oo:+oo)
-74 = 3*b+5*b-2 // - 3*b+5*b-2
2-(3*b)-(5*b)-74 = 0
2-3*b-5*b-74 = 0
-8*b-72 = 0 // + 72
-8*b = 72 // : -8
b = 72/(-8)
b = -9
b = -9
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