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b in (-oo:+oo)
(5/7)*b-((2/3)*b)-5 = -317/63 // + -317/63
(5/7)*b-((2/3)*b)-(-317/63)-5 = 0
(5/7)*b+(-2/3)*b+317/63-5 = 0
1/21*b+2/63 = 0 // - 2/63
1/21*b = -2/63 // : 1/21
b = -2/63/1/21
b = -2/3
b = -2/3
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