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(9*x)/8-x = x/40-(2/5) // - x/40-(2/5)
(9*x)/8-x-(x/40)+2/5 = 0
1/10*x+2/5 = 0 // - 2/5
1/10*x = -2/5 // : 1/10
x = -2/5/1/10
x = -4
x = -4
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