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w in (-oo:+oo)
(-3/7)*w = 2/5 // - 2/5
(-3/7)*w-(2/5) = 0
(-3/7)*w-2/5 = 0
-3/7*w-2/5 = 0 // + 2/5
-3/7*w = 2/5 // : -3/7
w = 2/5/(-3/7)
w = -14/15
w = -14/15
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