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(2*x)/5+(2/3)*((3*x)/5)+18 = x // - x
(2*x)/5+(2/3)*((3*x)/5)-x+18 = 0
18-1/5*x = 0 // - 18
-1/5*x = -18 // : -1/5
x = -18/(-1/5)
x = 90
x = 90
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