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w in (-oo:+oo)
1-4*w = (1/2)*w-5/4 // - (1/2)*w-5/4
1-4*w-((1/2)*w)-(-5/4) = 0
(-1/2)*w-4*w+5/4+1 = 0
9/4-9/2*w = 0 // - 9/4
-9/2*w = -9/4 // : -9/2
w = -9/4/(-9/2)
w = 1/2
w = 1/2
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