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12-((2*x)/18) = 3*x-(4/6) // - 3*x-(4/6)
4/6-((2*x)/18)-(3*x)+12 = 0
(-1/9)*x-3*x+4/6+12 = 0
38/3-28/9*x = 0 // - 38/3
-28/9*x = -38/3 // : -28/9
x = -38/3/(-28/9)
x = 57/14
x = 57/14
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