b+7=-9-3b

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



b+7=-9-3b

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

b+3b+9+7=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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