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2*x-(6*x)-(9/2)-(7/5) = 23/40 // - 23/40
2*x-(6*x)-(9/2)-(7/5)-(23/40) = 0
2*x-6*x-9/2-7/5-23/40 = 0
-4*x-259/40 = 0 // + 259/40
-4*x = 259/40 // : -4
x = 259/40/(-4)
x = -259/160
x = -259/160
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