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b in (-oo:+oo)
(-1/7)*b+b+3/4 = 165/28 // - 165/28
(-1/7)*b+b+3/4-(165/28) = 0
(-1/7)*b+b+3/4-165/28 = 0
6/7*b-36/7 = 0 // + 36/7
6/7*b = 36/7 // : 6/7
b = 36/7/6/7
b = 6
b = 6
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