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65=-a-(-13)
We simplify the equation to the form, which is simple to understand
65=-a-(-13)
Remove unnecessary parentheses
65=-a+13
We move all terms containing a to the left and all other terms to the right.
+1a=+13-65
We simplify left and right side of the equation.
+1a=-52
We divide both sides of the equation by 01 to get a.
a=-52
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