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w in (-oo:+oo)
(-2/3)*(w-(4/9)) = -4 // + 4
(-2/3)*(w-(4/9))+4 = 0
(-2/3)*(w-4/9)+4 = 0
4-2/3*(w-4/9) = 0
4-2/3*(w-4/9) = 0
116/27-2/3*w = 0
116/27-2/3*w = 0
116/27-2/3*w = 0 // - 116/27
-2/3*w = -116/27 // : -2/3
w = -116/27/(-2/3)
w = 58/9
w = 58/9
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