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(13a+11)+(a+7)=-2
We simplify the equation to the form, which is simple to understand
(13a+11)+(a+7)=-2
Remove unnecessary parentheses
13a+11+(a+7)=-2
Remove unnecessary parentheses
+13a+11+a+7=-2
We move all terms containing a to the left and all other terms to the right.
+13a+1a=-2-11-7
We simplify left and right side of the equation.
+14a=-20
We divide both sides of the equation by 14 to get a.
a=-1.42857142857
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