7a+4=9a+20

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Solution for 7a+4=9a+20 equation: 



7a+4=9a+20

We move all terms to the left:

7a+4-(9a+20)=0

We get rid of parentheses

7a-9a-20+4=0

We add all the numbers together, and all the variables

-2a-16=0

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

-2a=16

a=16/-2

a=-8

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