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b in (-oo:+oo)
22 = (7*b)/2 // - (7*b)/2
22-((7*b)/2) = 0
(-7/2)*b+22 = 0
22-7/2*b = 0 // - 22
-7/2*b = -22 // : -7/2
b = -22/(-7/2)
b = 44/7
b = 44/7
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