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(5/12)*(2/3)*(x-72) = 140 // - 140
(5/12)*(2/3)*(x-72)-140 = 0
5/18*(x-72)-140 = 0
5/18*(x-72)-140 = 0
5/18*x-160 = 0
5/18*x-160 = 0
5/18*x-160 = 0 // + 160
5/18*x = 160 // : 5/18
x = 160/5/18
x = 576
x = 576
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