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w in (-oo:+oo)
-((2/3)*w)-3/4 = -2/5 // + -2/5
-((2/3)*w)-3/4-(-2/5) = 0
(-2/3)*w-3/4+2/5 = 0
-2/3*w-7/20 = 0 // + 7/20
-2/3*w = 7/20 // : -2/3
w = 7/20/(-2/3)
w = -21/40
w = -21/40
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