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w in (-oo:+oo)
3/10-5*w = 81/20 // - 81/20
3/10-5*w-(81/20) = 0
3/10-5*w-81/20 = 0
-5*w-15/4 = 0 // + 15/4
-5*w = 15/4 // : -5
w = 15/4/(-5)
w = -3/4
w = -3/4
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