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5*x-40 = (5*x)/3 // - (5*x)/3
5*x-((5*x)/3)-40 = 0
5*x+(-5/3)*x-40 = 0
10/3*x-40 = 0 // + 40
10/3*x = 40 // : 10/3
x = 40/10/3
x = 12
x = 12
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