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b in (-oo:+oo)
5*(7-1*b) = -15 // + 15
5*(7-1*b)+15 = 0
5*(7-b)+15 = 0
5*(7-b)+15 = 0
50-5*b = 0
50-5*b = 0
50-5*b = 0 // - 50
-5*b = -50 // : -5
b = -50/(-5)
b = 10
b = 10
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