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b in (-oo:+oo)
7/12-((1/3)*b) = (1/4)*b+5/6 // - (1/4)*b+5/6
7/12-((1/3)*b)-((1/4)*b)-(5/6) = 0
(-1/3)*b+(-1/4)*b+7/12-5/6 = 0
-7/12*b-1/4 = 0 // + 1/4
-7/12*b = 1/4 // : -7/12
b = 1/4/(-7/12)
b = -3/7
b = -3/7
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