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(3*x)/4-((2*x)/5) = 1 // - 1
(3*x)/4-((2*x)/5)-1 = 0
(3*x)/4+(-2/5)*x-1 = 0
7/20*x-1 = 0 // + 1
7/20*x = 1 // : 7/20
x = 1/7/20
x = 20/7
x = 20/7
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