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