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w in (-oo:+oo)
(2/3)*(w-(4/9)) = -4/5 // + -4/5
(2/3)*(w-(4/9))-(-4/5) = 0
(2/3)*(w-4/9)+4/5 = 0
2/3*(w-4/9)+4/5 = 0
(2/3*5*(w-4/9))/5+4/5 = 0
2/3*5*(w-4/9)+4 = 0
10/3*w+68/27 = 0
(10/3*w+68/27)/5 = 0
(10/3*w+68/27)/5 = 0 // * 5
10/3*w+68/27 = 0
10/3*w+68/27 = 0 // - 68/27
10/3*w = -68/27 // : 10/3
w = -68/27/10/3
w = -34/45
w = -34/45
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