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b in (-oo:+oo)
102 = (17*b)/2 // - (17*b)/2
102-((17*b)/2) = 0
(-17/2)*b+102 = 0
102-17/2*b = 0 // - 102
-17/2*b = -102 // : -17/2
b = -102/(-17/2)
b = 12
b = 12
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