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w in (-oo:+oo)
-7 = w-(5*w)+1/4+9/3 // - w-(5*w)+1/4+9/3
5*w-w-(1/4)-(9/3)-7 = 0
5*w-w-1/4-7-3 = 0
4*w-41/4 = 0 // + 41/4
4*w = 41/4 // : 4
w = 41/4/4
w = 41/16
w = 41/16
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