3b+9=-7-b

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



3b+9=-7-b

We move all terms to the left:

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

We add all the numbers together, and all the variables

3b-(-1b-7)+9=0

We get rid of parentheses

3b+1b+7+9=0

We add all the numbers together, and all the variables

4b+16=0

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

4b=-16

b=-16/4

b=-4

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