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a-(2+5)=15
We simplify the equation to the form, which is simple to understand
a-(2+5)=15
Simplifying terms in parentheses
a-(+7)=15
Remove unnecessary parentheses
a-7=15
We move all terms containing a to the left and all other terms to the right.
+1a=+15+7
We simplify left and right side of the equation.
+1a=+22
We divide both sides of the equation by 1 to get a.
a=22
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