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b in (-oo:+oo)
5 = (-1/2)*b // - (-1/2)*b
5-((-1/2)*b) = 0
(1/2)*b+5 = 0
1/2*b+5 = 0 // - 5
1/2*b = -5 // : 1/2
b = -5/1/2
b = -10
b = -10
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