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w in (-oo:+oo)
(-1/2)*w+1/4 = -3/4 // + -3/4
(-1/2)*w+1/4-(-3/4) = 0
(-1/2)*w+1/4+3/4 = 0
1-1/2*w = 0 // - 1
-1/2*w = -1 // : -1/2
w = -1/(-1/2)
w = 2
w = 2
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