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b in (-oo:+oo)
(4/7)*b+7 = 50/7 // - 50/7
(4/7)*b-(50/7)+7 = 0
(4/7)*b-50/7+7 = 0
4/7*b-1/7 = 0 // + 1/7
4/7*b = 1/7 // : 4/7
b = 1/7/4/7
b = 1/4
b = 1/4
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