3b-(6-b)=-21

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Solution for 3b-(6-b)=-21 equation: 



3b-(6-b)=-21

We move all terms to the left:

3b-(6-b)-(-21)=0

We add all the numbers together, and all the variables

3b-(-1b+6)-(-21)=0

We add all the numbers together, and all the variables

3b-(-1b+6)+21=0

We get rid of parentheses

3b+1b-6+21=0

We add all the numbers together, and all the variables

4b+15=0

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

4b=-15

b=-15/4

b=-3+3/4

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