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b in (-oo:+oo)
-29/28 = (-6/7)*b+(1/2)*b-(5/7) // - (-6/7)*b+(1/2)*b-(5/7)
5/7-((-6/7)*b)-((1/2)*b)-29/28 = 0
(6/7)*b+(-1/2)*b-29/28+5/7 = 0
5/14*b-9/28 = 0 // + 9/28
5/14*b = 9/28 // : 5/14
b = 9/28/5/14
b = 9/10
b = 9/10
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