9a+86=21a-58

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Solution for 9a+86=21a-58 equation: 



9a+86=21a-58

We move all terms to the left:

9a+86-(21a-58)=0

We get rid of parentheses

9a-21a+58+86=0

We add all the numbers together, and all the variables

-12a+144=0

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

-12a=-144

a=-144/-12

a=+12

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