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b in (-oo:+oo)
51/2 = 7-((1/2)*b) // - 7-((1/2)*b)
(1/2)*b+51/2-7 = 0
1/2*b+37/2 = 0 // - 37/2
1/2*b = -37/2 // : 1/2
b = -37/2/1/2
b = -37
b = -37
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