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4*x-(9*x) = 11/12 // - 11/12
4*x-(9*x)-(11/12) = 0
4*x-9*x-11/12 = 0
-5*x-11/12 = 0 // + 11/12
-5*x = 11/12 // : -5
x = 11/12/(-5)
x = -11/60
x = -11/60
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