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3*((5*x)/3) = 3*40 // - 3*40
3*((5*x)/3)-(3*40) = 0
3*((5*x)/3)-120 = 0
5*x-120 = 0 // + 120
5*x = 120 // : 5
x = 120/5
x = 24
x = 24
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