5a-7=13+7a

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Solution for 5a-7=13+7a equation: 



5a-7=13+7a

We move all terms to the left:

5a-7-(13+7a)=0

We add all the numbers together, and all the variables

5a-(7a+13)-7=0

We get rid of parentheses

5a-7a-13-7=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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