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1/40 = x/5-(9/8) // - x/5-(9/8)
1/40-(x/5)+9/8 = 0
23/20-1/5*x = 0 // - 23/20
-1/5*x = -23/20 // : -1/5
x = -23/20/(-1/5)
x = 23/4
x = 23/4
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