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(3*x)/8-x = x/40-(7/5) // - x/40-(7/5)
(3*x)/8-x-(x/40)+7/5 = 0
7/5-13/20*x = 0 // - 7/5
-13/20*x = -7/5 // : -13/20
x = -7/5/(-13/20)
x = 28/13
x = 28/13
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