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a+9=2a-(a+5)
We simplify the equation to the form, which is simple to understand
a+9=2a-(a+5)
Remove unnecessary parentheses
a+9=2a-1a-5
We move all terms containing a to the left and all other terms to the right.
+1a-2a+1a=-5-9
We simplify left and right side of the equation.
a=-14
0=-14
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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