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b in (-oo:+oo)
(1/5)*(b+12) = 25 // - 25
(1/5)*(b+12)-25 = 0
1/5*(b+12)-25 = 0
1/5*(b+12)-25 = 0
1/5*b-113/5 = 0
1/5*b-113/5 = 0
1/5*b-113/5 = 0 // + 113/5
1/5*b = 113/5 // : 1/5
b = 113/5/1/5
b = 113
b = 113
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