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(2/5)*x-((3/8)*x) = 5 // - 5
(2/5)*x-((3/8)*x)-5 = 0
(2/5)*x+(-3/8)*x-5 = 0
1/40*x-5 = 0 // + 5
1/40*x = 5 // : 1/40
x = 5/1/40
x = 200
x = 200
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