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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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