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(x+2)-x=9
We simplify the equation to the form, which is simple to understand
(x+2)-x=9
Remove unnecessary parentheses
x+2-x=9
We move all terms containing x to the left and all other terms to the right.
+1x-1x=+9-2
We simplify left and right side of the equation.
0x=+7
0=7
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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