12a-20=9a+10

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Solution for 12a-20=9a+10 equation: 



12a-20=9a+10

We move all terms to the left:

12a-20-(9a+10)=0

We get rid of parentheses

12a-9a-10-20=0

We add all the numbers together, and all the variables

3a-30=0

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

3a=30

a=30/3

a=10

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