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w in (-oo:+oo)
2/30 = w/10 // - w/10
2/30-(w/10) = 0
1/15-1/10*w = 0 // - 1/15
-1/10*w = -1/15 // : -1/10
w = -1/15/(-1/10)
w = 2/3
w = 2/3
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