a-20=-13

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Solution for a-20=-13 equation:


a-20=-13

We simplify the equation to the form, which is simple to understand 
a-20=-13

We move all terms containing a to the left and all other terms to the right. 
+1a=-13+20

We simplify left and right side of the equation. 
+1a=+7

We divide both sides of the equation by 1 to get a. 
a=7

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