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(2/5)*x-((1/3)*x) = 40 // - 40
(2/5)*x-((1/3)*x)-40 = 0
(2/5)*x+(-1/3)*x-40 = 0
1/15*x-40 = 0 // + 40
1/15*x = 40 // : 1/15
x = 40/1/15
x = 600
x = 600
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