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b in (-oo:+oo)
(1/7)*b+(4/7)*b-(3/4) = 59/28 // - 59/28
(1/7)*b+(4/7)*b-(3/4)-(59/28) = 0
(1/7)*b+(4/7)*b-3/4-59/28 = 0
5/7*b-20/7 = 0 // + 20/7
5/7*b = 20/7 // : 5/7
b = 20/7/5/7
b = 4
b = 4
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