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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-148/27 = 0
(10/3*W-148/27)/5 = 0
(10/3*W-148/27)/5 = 0 // * 5
10/3*W-148/27 = 0
10/3*W-148/27 = 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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