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w in (-oo:+oo)
3/10-3*w = -19/20 // + -19/20
3/10-3*w-(-19/20) = 0
3/10-3*w+19/20 = 0
5/4-3*w = 0 // - 5/4
-3*w = -5/4 // : -3
w = -5/4/(-3)
w = 5/12
w = 5/12
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