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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
4/5-2/3*(w-4/9) = 0
(-2/3*5*(w-4/9))/5+4/5 = 0
4-2/3*5*(w-4/9) = 0
148/27-10/3*w = 0
(148/27-10/3*w)/5 = 0
(148/27-10/3*w)/5 = 0 // * 5
148/27-10/3*w = 0
148/27-10/3*w = 0 // - 148/27
-10/3*w = -148/27 // : -10/3
w = -148/27/(-10/3)
w = 74/45
w = 74/45
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