13=3-10a

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Solution for 13=3-10a equation: 



13=3-10a

We move all terms to the left:

13-(3-10a)=0

We add all the numbers together, and all the variables

-(-10a+3)+13=0

We get rid of parentheses

10a-3+13=0

We add all the numbers together, and all the variables

10a+10=0

We move all terms containing a to the left, all other terms to the right

10a=-10

a=-10/10

a=-1

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