10a+10=9a+21

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Solution for 10a+10=9a+21 equation: 



10a+10=9a+21

We move all terms to the left:

10a+10-(9a+21)=0

We get rid of parentheses

10a-9a-21+10=0

We add all the numbers together, and all the variables

a-11=0

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

a=11

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