13+6a=a-7

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Solution for 13+6a=a-7 equation: 



13+6a=a-7

We move all terms to the left:

13+6a-(a-7)=0

We get rid of parentheses

6a-a+7+13=0

We add all the numbers together, and all the variables

5a+20=0

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

5a=-20

a=-20/5

a=-4

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