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b in (-oo:+oo)
(5/7)*b-4*b+5 = 288/7 // - 288/7
(5/7)*b-4*b-(288/7)+5 = 0
(5/7)*b-4*b-288/7+5 = 0
-23/7*b-253/7 = 0 // + 253/7
-23/7*b = 253/7 // : -23/7
b = 253/7/(-23/7)
b = -11
b = -11
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