-4(b+1)-7(-2b+1)=-21

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Solution for -4(b+1)-7(-2b+1)=-21 equation: 



-4(b+1)-7(-2b+1)=-21

We move all terms to the left:

-4(b+1)-7(-2b+1)-(-21)=0

We add all the numbers together, and all the variables

-4(b+1)-7(-2b+1)+21=0

We multiply parentheses

-4b+14b-4-7+21=0

We add all the numbers together, and all the variables

10b+10=0

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

10b=-10

b=-10/10

b=-1

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