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18-2*x = X/3 // - X/3
18-(X/3)-2*x = 0
18-1/3*X-2*x = 0 // - 18-1/3*X
-2*x = -(18-1/3*X) // : -2
x = (-(18-1/3*X))/(-2)
x = (18-1/3*X)/2
x = (18-1/3*X)/2
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