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w in (-oo:+oo)
(-7/5)*w-(4/5) = 2*w-(3/2) // - 2*w-(3/2)
(-7/5)*w-(2*w)-(4/5)+3/2 = 0
(-7/5)*w-2*w-4/5+3/2 = 0
7/10-17/5*w = 0 // - 7/10
-17/5*w = -7/10 // : -17/5
w = -7/10/(-17/5)
w = 7/34
w = 7/34
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