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w in (-oo:+oo)
0.75 = w+2/5 // - w+2/5
0.75-w-(2/5) = 0
0.75-w-2/5 = 0
0.35-w = 0 // - 0.35
-w = -0.35 // * -1
w = 0.35
w = 0.35
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