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w in (-oo:+oo)
(-7*w)/5 = 4/10 // - 4/10
(-7*w)/5-(4/10) = 0
(-7*w)/5-2/5 = 0
-7/5*w-2/5 = 0 // + 2/5
-7/5*w = 2/5 // : -7/5
w = 2/5/(-7/5)
w = -2/7
w = -2/7
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