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w in (-oo:+oo)
-((1/3)*w)-4/5 = -1/2 // + -1/2
-((1/3)*w)-4/5-(-1/2) = 0
(-1/3)*w-4/5+1/2 = 0
-1/3*w-3/10 = 0 // + 3/10
-1/3*w = 3/10 // : -1/3
w = 3/10/(-1/3)
w = -9/10
w = -9/10
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