31a-2=8a+90

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Solution for 31a-2=8a+90 equation: 



31a-2=8a+90

We move all terms to the left:

31a-2-(8a+90)=0

We get rid of parentheses

31a-8a-90-2=0

We add all the numbers together, and all the variables

23a-92=0

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

23a=92

a=92/23

a=4

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