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b in (-oo:+oo)
b+7 = (1/2)*(4*b-2) // - (1/2)*(4*b-2)
b-((1/2)*(4*b-2))+7 = 0
(-1/2)*(4*b-2)+b+7 = 0
b-1/2*(4*b-2)+7 = 0
b-1/2*(4*b-2)+7 = 0
1-b+7 = 0
8-b = 0
8-b = 0
8-b = 0 // - 8
-b = -8 // * -1
b = 8
b = 8
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