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w in (-oo:+oo)
(2/3)*(w-(4/9)) = -4/3 // + -4/3
(2/3)*(w-(4/9))-(-4/3) = 0
(2/3)*(w-4/9)+4/3 = 0
2/3*(w-4/9)+4/3 = 0
(2/3*3*(w-4/9))/3+4/3 = 0
2/3*3*(w-4/9)+4 = 0
2*w+28/9 = 0
(2*w+28/9)/3 = 0
(2*w+28/9)/3 = 0 // * 3
2*w+28/9 = 0
2*w+28/9 = 0 // - 28/9
2*w = -28/9 // : 2
w = -28/9/2
w = -14/9
w = -14/9
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