-9=a+3-7

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Solution for -9=a+3-7 equation: 



-9=a+3-7

We move all terms to the left:

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

We add all the numbers together, and all the variables

-(a-4)-9=0

We get rid of parentheses

-a+4-9=0

We add all the numbers together, and all the variables

-1a-5=0

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

-a=5

a=5/-1

a=-5

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