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19(a+13)=171
We simplify the equation to the form, which is simple to understand
19(a+13)=171
Reorder the terms in parentheses
+(+19a+247)=171
Remove unnecessary parentheses
+19a+247=+171
We move all terms containing a to the left and all other terms to the right.
+19a=+171-247
We simplify left and right side of the equation.
+19a=-76
We divide both sides of the equation by 19 to get a.
a=-4
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