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w in (-oo:+oo)
(-2/3)*(w-(4/9)) = -4/6 // + -4/6
(-2/3)*(w-(4/9))-(-4/6) = 0
(-2/3)*(w-4/9)+2/3 = 0
2/3-2/3*(w-4/9) = 0
(-2/3*3*(w-4/9))/3+2/3 = 0
2-2/3*3*(w-4/9) = 0
26/9-2*w = 0
(26/9-2*w)/3 = 0
(26/9-2*w)/3 = 0 // * 3
26/9-2*w = 0
26/9-2*w = 0 // - 26/9
-2*w = -26/9 // : -2
w = -26/9/(-2)
w = 13/9
w = 13/9
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