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w in (-oo:+oo)
-((2/3)*w)-2/5 = -1/4 // + -1/4
-((2/3)*w)-2/5-(-1/4) = 0
(-2/3)*w-2/5+1/4 = 0
-2/3*w-3/20 = 0 // + 3/20
-2/3*w = 3/20 // : -2/3
w = 3/20/(-2/3)
w = -9/40
w = -9/40
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