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b in (-oo:+oo)
(-1/2)*b+(1/7)*b-(7/8) = -7/8 // + -7/8
(-1/2)*b+(1/7)*b-(7/8)-(-7/8) = 0
(-1/2)*b+(1/7)*b-7/8+7/8 = 0
-5/14*b = 0 // : -5/14
b = 0
b = 0
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