4-(2a+7)=9

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Solution for 4-(2a+7)=9 equation: 



4-(2a+7)=9

We move all terms to the left:

4-(2a+7)-(9)=0

We add all the numbers together, and all the variables

-(2a+7)-5=0

We get rid of parentheses

-2a-7-5=0

We add all the numbers together, and all the variables

-2a-12=0

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

-2a=12

a=12/-2

a=-6

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