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b in (-oo:+oo)
-17/84 = (-3/7)*b-((1/4)*b)+1/4 // - (-3/7)*b-((1/4)*b)+1/4
(1/4)*b-((-3/7)*b)-17/84-(1/4) = 0
(3/7)*b+(1/4)*b-17/84-1/4 = 0
19/28*b-19/42 = 0 // + 19/42
19/28*b = 19/42 // : 19/28
b = 19/42/19/28
b = 2/3
b = 2/3
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