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(2x-4)-(-x+9)=0
We simplify the equation to the form, which is simple to understand
(2x-4)-(-x+9)=0
Remove unnecessary parentheses
2x-4-(-x+9)=0
Remove unnecessary parentheses
2x-4+1x-9=0
We move all terms containing x to the left and all other terms to the right.
+2x+1x=0+4+9
We simplify left and right side of the equation.
+3x=+13
We divide both sides of the equation by 3 to get x.
x=4.3333333333333
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