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-13a-9a- -10a- -14a=-20
We simplify the equation to the form, which is simple to understand
-13a-9a+10a+14a=-20
We move all terms containing a to the left and all other terms to the right.
-13a-9a+10a+14a=-20
We simplify left and right side of the equation.
+2a=-20
We divide both sides of the equation by 2 to get a.
a=-10
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