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b in (-oo:+oo)
7*b+2 = 15/4 // - 15/4
7*b-(15/4)+2 = 0
7*b-15/4+2 = 0
7*b-7/4 = 0 // + 7/4
7*b = 7/4 // : 7
b = 7/4/7
b = 1/4
b = 1/4
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