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9-x-(6*x) = 69/10 // - 69/10
9-x-(6*x)-(69/10) = 0
9-x-6*x-69/10 = 0
21/10-7*x = 0 // - 21/10
-7*x = -21/10 // : -7
x = -21/10/(-7)
x = 3/10
x = 3/10
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