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w in (-oo:+oo)
4-(7*w) = 1-((2/3)*(2*w-5)) // - 1-((2/3)*(2*w-5))
(2/3)*(2*w-5)-(7*w)-1+4 = 0
(2/3)*(2*w-5)-7*w-1+4 = 0
2/3*(2*w-5)-7*w-1+4 = 0
2/3*(2*w-5)-7*w-1+4 = 0
4-17/3*w-10/3-1 = 0
4-17/3*w-13/3 = 0
-17/3*w-1/3 = 0
-17/3*w-1/3 = 0
-17/3*w-1/3 = 0 // + 1/3
-17/3*w = 1/3 // : -17/3
w = 1/3/(-17/3)
w = -1/17
w = -1/17
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