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w in (-oo:+oo)
(1/4)*w = 9/10 // - 9/10
(1/4)*w-(9/10) = 0
(1/4)*w-9/10 = 0
1/4*w-9/10 = 0 // + 9/10
1/4*w = 9/10 // : 1/4
w = 9/10/1/4
w = 18/5
w = 18/5
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