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a-6=7-(9+a)
We simplify the equation to the form, which is simple to understand
a-6=7-(9+a)
Remove unnecessary parentheses
a-6=7-9-1a
We move all terms containing a to the left and all other terms to the right.
+1a+1a=+7-9+6
We simplify left and right side of the equation.
+2a=+4
We divide both sides of the equation by 2 to get a.
a=2
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