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w in (-oo:+oo)
(-1/5)*w-(8/7) = -3/2 // + -3/2
(-1/5)*w-(8/7)-(-3/2) = 0
(-1/5)*w-8/7+3/2 = 0
5/14-1/5*w = 0 // - 5/14
-1/5*w = -5/14 // : -1/5
w = -5/14/(-1/5)
w = 25/14
w = 25/14
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