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9-(3*x) = (1/2)*(4*x-4) // - (1/2)*(4*x-4)
9-((1/2)*(4*x-4))-(3*x) = 0
(-1/2)*(4*x-4)-3*x+9 = 0
9-1/2*(4*x-4)-3*x = 0
9-1/2*(4*x-4)-3*x = 0
2-5*x+9 = 0
11-5*x = 0
11-5*x = 0
11-5*x = 0 // - 11
-5*x = -11 // : -5
x = -11/(-5)
x = 11/5
x = 11/5
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