9-3(9+2)=7+a

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Solution for 9-3(9+2)=7+a equation: 



9-3(9+2)=7+a

We move all terms to the left:

9-3(9+2)-(7+a)=0

We add all the numbers together, and all the variables

-(a+7)+9-311=0

We add all the numbers together, and all the variables

-(a+7)-302=0

We get rid of parentheses

-a-7-302=0

We add all the numbers together, and all the variables

-1a-309=0

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

-a=309

a=309/-1

a=-309

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