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w in (-oo:+oo)
w/5-7 = (4*w)/5 // - (4*w)/5
w/5-((4*w)/5)-7 = 0
w/5+(-4/5)*w-7 = 0
-3/5*w-7 = 0 // + 7
-3/5*w = 7 // : -3/5
w = 7/(-3/5)
w = -35/3
w = -35/3
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