a+7+9a=13a-20

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Solution for a+7+9a=13a-20 equation: 



a+7+9a=13a-20

We move all terms to the left:

a+7+9a-(13a-20)=0

We add all the numbers together, and all the variables

10a-(13a-20)+7=0

We get rid of parentheses

10a-13a+20+7=0

We add all the numbers together, and all the variables

-3a+27=0

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

-3a=-27

a=-27/-3

a=+9

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