7+4a=9a-13

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Solution for 7+4a=9a-13 equation: 



7+4a=9a-13

We move all terms to the left:

7+4a-(9a-13)=0

We get rid of parentheses

4a-9a+13+7=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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