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5*(2-x) = (6*x+9)/3 // - (6*x+9)/3
5*(2-x)-((6*x+9)/3) = 0
5*(2-x)+(-1*(6*x+9))/3 = 0
(3*5*(2-x))/3+(-1*(6*x+9))/3 = 0
3*5*(2-x)-1*(6*x+9) = 0
21-21*x = 0
(21-21*x)/3 = 0
(21-21*x)/3 = 0 // * 3
21-21*x = 0
21-21*x = 0 // - 21
-21*x = -21 // : -21
x = -21/(-21)
x = 1
x = 1
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