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2a-a-(-7)=11
We simplify the equation to the form, which is simple to understand
2a-a-(-7)=11
Remove unnecessary parentheses
2a-a+7=11
We move all terms containing a to the left and all other terms to the right.
+2a-1a=+11-7
We simplify left and right side of the equation.
+1a=+4
We divide both sides of the equation by 1 to get a.
a=4
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