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W in (-oo:+oo)
(-2/3)*(W-(4/9)) = -45 // + 45
(-2/3)*(W-(4/9))+45 = 0
(-2/3)*(W-4/9)+45 = 0
45-2/3*(W-4/9) = 0
45-2/3*(W-4/9) = 0
1223/27-2/3*W = 0
1223/27-2/3*W = 0
1223/27-2/3*W = 0 // - 1223/27
-2/3*W = -1223/27 // : -2/3
W = -1223/27/(-2/3)
W = 1223/18
W = 1223/18
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