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(2*x)/5-x = x/40-(9/8) // - x/40-(9/8)
(2*x)/5-x-(x/40)+9/8 = 0
9/8-5/8*x = 0 // - 9/8
-5/8*x = -9/8 // : -5/8
x = -9/8/(-5/8)
x = 9/5
x = 9/5
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