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b in (-oo:+oo)
(3/7)*(b-14) = -12 // + 12
(3/7)*(b-14)+12 = 0
3/7*(b-14)+12 = 0
3/7*(b-14)+12 = 0
3/7*b+6 = 0
3/7*b+6 = 0
3/7*b+6 = 0 // - 6
3/7*b = -6 // : 3/7
b = -6/3/7
b = -14
b = -14
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