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5*x-(9*x)+2/5-(2/10) = 6 // - 6
5*x-(9*x)+2/5-(2/10)-6 = 0
5*x-9*x+2/5-1/5-6 = 0
-4*x-29/5 = 0 // + 29/5
-4*x = 29/5 // : -4
x = 29/5/(-4)
x = -29/20
x = -29/20
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