10a+13-3a-6=21a-14-9a-9

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Solution for 10a+13-3a-6=21a-14-9a-9 equation: 



10a+13-3a-6=21a-14-9a-9

We move all terms to the left:

10a+13-3a-6-(21a-14-9a-9)=0

We add all the numbers together, and all the variables

10a-3a-(12a-23)+13-6=0

We add all the numbers together, and all the variables

7a-(12a-23)+7=0

We get rid of parentheses

7a-12a+23+7=0

We add all the numbers together, and all the variables

-5a+30=0

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

-5a=-30

a=-30/-5

a=+6

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