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13(-a+9)=631-a
We simplify the equation to the form, which is simple to understand
13(-a+9)=631-a
Reorder the terms in parentheses
+(-13a+117)=631-a
Remove unnecessary parentheses
-13a+117=+631-a
We move all terms containing a to the left and all other terms to the right.
-13a+1a=+631-117
We simplify left and right side of the equation.
-12a=+514
We divide both sides of the equation by -12 to get a.
a=-42.833333333333
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