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13-(8-2a)=11
We simplify the equation to the form, which is simple to understand
13-(8-2a)=11
Remove unnecessary parentheses
13-8+2a=11
We move all terms containing a to the left and all other terms to the right.
+2a=+11-13+8
We simplify left and right side of the equation.
+2a=+6
We divide both sides of the equation by 2 to get a.
a=3
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