-13=7-2a

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Solution for -13=7-2a equation: 



-13=7-2a

We move all terms to the left:

-13-(7-2a)=0

We add all the numbers together, and all the variables

-(-2a+7)-13=0

We get rid of parentheses

2a-7-13=0

We add all the numbers together, and all the variables

2a-20=0

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

2a=20

a=20/2

a=10

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