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b in (-oo:+oo)
(4/7)*b+2*b-(3/4) = -75/196 // + -75/196
(4/7)*b+2*b-(3/4)-(-75/196) = 0
(4/7)*b+2*b-3/4+75/196 = 0
18/7*b-18/49 = 0 // + 18/49
18/7*b = 18/49 // : 18/7
b = 18/49/18/7
b = 1/7
b = 1/7
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