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b in (-oo:+oo)
3-((2/4)*b) = 1/36-7 // - 1/36-7
3-((2/4)*b)-(1/36)+7 = 0
(-1/2)*b-1/36+3+7 = 0
359/36-1/2*b = 0 // - 359/36
-1/2*b = -359/36 // : -1/2
b = -359/36/(-1/2)
b = 359/18
b = 359/18
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