3b+7=-4b

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Solution for 3b+7=-4b equation: 



3b+7=-4b

We move all terms to the left:

3b+7-(-4b)=0

We get rid of parentheses

3b+4b+7=0

We add all the numbers together, and all the variables

7b+7=0

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

7b=-7

b=-7/7

b=-1

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