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(4/5)*x-x = x/10-(9/2) // - x/10-(9/2)
(4/5)*x-x-(x/10)+9/2 = 0
9/2-3/10*x = 0 // - 9/2
-3/10*x = -9/2 // : -3/10
x = -9/2/(-3/10)
x = 15
x = 15
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