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b in (-oo:+oo)
113/36 = (-1/3)*b-(2*b)+1 // - (-1/3)*b-(2*b)+1
2*b-((-1/3)*b)+113/36-1 = 0
(1/3)*b+2*b+113/36-1 = 0
7/3*b+77/36 = 0 // - 77/36
7/3*b = -77/36 // : 7/3
b = -77/36/7/3
b = -11/12
b = -11/12
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