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b in (-oo:+oo)
(3/7)*b-(3/5) = -93/280 // + -93/280
(3/7)*b-(3/5)-(-93/280) = 0
(3/7)*b-3/5+93/280 = 0
3/7*b-15/56 = 0 // + 15/56
3/7*b = 15/56 // : 3/7
b = 15/56/3/7
b = 5/8
b = 5/8
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