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