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(3/4)*x-(8/5) = (2/5)*x-(3/2) // - (2/5)*x-(3/2)
(3/4)*x-((2/5)*x)-(8/5)+3/2 = 0
(3/4)*x+(-2/5)*x-8/5+3/2 = 0
7/20*x-1/10 = 0 // + 1/10
7/20*x = 1/10 // : 7/20
x = 1/10/7/20
x = 2/7
x = 2/7
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