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