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b in (-oo:+oo)
(1/5)*(15*b-7) = 3*b-7 // - 3*b-7
(1/5)*(15*b-7)-(3*b)+7 = 0
(1/5)*(15*b-7)-3*b+7 = 0
1/5*(15*b-7)-3*b+7 = 0
1/5*(15*b-7)-3*b+7 = 0
7-7/5 = 0
28/5 = 0
28/5 = 0
28/5 = 0 // * 5
28 = 0
28 = 0
b belongs to the empty set
b belongs to the empty set
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