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b in (-oo:+oo)
(1/3)*b-(2/7) = 15/7 // - 15/7
(1/3)*b-(2/7)-(15/7) = 0
(1/3)*b-2/7-15/7 = 0
1/3*b-17/7 = 0 // + 17/7
1/3*b = 17/7 // : 1/3
b = 17/7/1/3
b = 51/7
b = 51/7
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