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-(-7+a)=0
We simplify the equation to the form, which is simple to understand
-(-7+a)=0
Remove unnecessary parentheses
+7-1a=0
We move all terms containing a to the left and all other terms to the right.
-1a=0-7
We simplify left and right side of the equation.
-1a=-7
We divide both sides of the equation by -1 to get a.
a=7
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