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(1/2)*(6*x-9) = 4*x-9 // - 4*x-9
(1/2)*(6*x-9)-(4*x)+9 = 0
(1/2)*(6*x-9)-4*x+9 = 0
1/2*(6*x-9)-4*x+9 = 0
1/2*(6*x-9)-4*x+9 = 0
9-x-9/2 = 0
9/2-x = 0
9/2-x = 0
9/2-x = 0 // - 9/2
-x = -9/2 // * -1
x = 9/2
x = 9/2
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