4a-31=9a-91

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Solution for 4a-31=9a-91 equation: 



4a-31=9a-91

We move all terms to the left:

4a-31-(9a-91)=0

We get rid of parentheses

4a-9a+91-31=0

We add all the numbers together, and all the variables

-5a+60=0

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

-5a=-60

a=-60/-5

a=+12

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