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(2/3)*x+40 = x/2-(x/2)-((2*x)/9) // - x/2-(x/2)-((2*x)/9)
(2/3)*x-(x/2)+x/2+(2*x)/9+40 = 0
8/9*x+40 = 0 // - 40
8/9*x = -40 // : 8/9
x = -40/8/9
x = -45
x = -45
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