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b in (-oo:+oo)
-5*b-(5*b)-3 = 87 // - 87
-5*b-(5*b)-87-3 = 0
-5*b-5*b-87-3 = 0
-10*b-90 = 0 // + 90
-10*b = 90 // : -10
b = 90/(-10)
b = -9
b = -9
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