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b in (-oo:+oo)
(3*(b+5))/5 = 9 // - 9
(3*(b+5))/5-9 = 0
(3*(b+5))/5+(-9*5)/5 = 0
3*(b+5)-9*5 = 0
3*b-30 = 0
(3*b-30)/5 = 0
(3*b-30)/5 = 0 // * 5
3*b-30 = 0
3*b-30 = 0 // + 30
3*b = 30 // : 3
b = 30/3
b = 10
b = 10
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