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b in (-oo:+oo)
(1/2)*b+(2/7)*b-(3/4) = -263/28 // + -263/28
(1/2)*b+(2/7)*b-(3/4)-(-263/28) = 0
(1/2)*b+(2/7)*b-3/4+263/28 = 0
11/14*b+121/14 = 0 // - 121/14
11/14*b = -121/14 // : 11/14
b = -121/14/11/14
b = -11
b = -11
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