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w in (-oo:+oo)
(-1/2)*w-(8/3) = -7/5 // + -7/5
(-1/2)*w-(8/3)-(-7/5) = 0
(-1/2)*w-8/3+7/5 = 0
-1/2*w-19/15 = 0 // + 19/15
-1/2*w = 19/15 // : -1/2
w = 19/15/(-1/2)
w = -38/15
w = -38/15
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