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(4*x)/5-((3*x)/8) = 1 // - 1
(4*x)/5-((3*x)/8)-1 = 0
(4*x)/5+(-3/8)*x-1 = 0
17/40*x-1 = 0 // + 1
17/40*x = 1 // : 17/40
x = 1/17/40
x = 40/17
x = 40/17
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