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x+x+9=2x-9
We simplify the equation to the form, which is simple to understand
x+x+9=2x-9
We move all terms containing x to the left and all other terms to the right.
+1x+1x-2x=-9-9
We simplify left and right side of the equation.
0x=-18
0=-18
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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