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b in (-oo:+oo)
(4/7)*b+2/5 = -2/35 // + -2/35
(4/7)*b+2/5-(-2/35) = 0
(4/7)*b+2/5+2/35 = 0
4/7*b+16/35 = 0 // - 16/35
4/7*b = -16/35 // : 4/7
b = -16/35/4/7
b = -4/5
b = -4/5
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