-a-3=--10

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Solution for -a-3=--10 equation:


-a-3=--10

We simplify the equation to the form, which is simple to understand 
-a-3=+10

We move all terms containing a to the left and all other terms to the right. 
-1a=+10+3

We simplify left and right side of the equation. 
-1a=+13

We divide both sides of the equation by -1 to get a. 
a=-13

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