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(2/5)*x-(7/8) = (1/20)*x+9/40 // - (1/20)*x+9/40
(2/5)*x-((1/20)*x)-(7/8)-(9/40) = 0
(2/5)*x+(-1/20)*x-7/8-9/40 = 0
7/20*x-11/10 = 0 // + 11/10
7/20*x = 11/10 // : 7/20
x = 11/10/7/20
x = 22/7
x = 22/7
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