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w in (-oo:+oo)
(-2/3)*(w-(4/9)) = -4/9 // + -4/9
(-2/3)*(w-(4/9))-(-4/9) = 0
(-2/3)*(w-4/9)+4/9 = 0
4/9-2/3*(w-4/9) = 0
(-2/3*9*(w-4/9))/9+4/9 = 0
4-2/3*9*(w-4/9) = 0
20/3-6*w = 0
(20/3-6*w)/9 = 0
(20/3-6*w)/9 = 0 // * 9
20/3-6*w = 0
20/3-6*w = 0 // - 20/3
-6*w = -20/3 // : -6
w = -20/3/(-6)
w = 10/9
w = 10/9
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