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w in (-oo:+oo)
1/2-((3/4)*w) = -1/10 // + -1/10
1/2-((3/4)*w)-(-1/10) = 0
(-3/4)*w+1/2+1/10 = 0
3/5-3/4*w = 0 // - 3/5
-3/4*w = -3/5 // : -3/4
w = -3/5/(-3/4)
w = 4/5
w = 4/5
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