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w in (-oo:+oo)
(2/3)*w-(2/5) = w-(1/5)-7 // - w-(1/5)-7
(2/3)*w-w-(2/5)+1/5+7 = 0
(2/3)*w-w-2/5+1/5+7 = 0
34/5-1/3*w = 0 // - 34/5
-1/3*w = -34/5 // : -1/3
w = -34/5/(-1/3)
w = 102/5
w = 102/5
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