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4=-18-7b

We move all terms to the left:

4-(-18-7b)=0

We add all the numbers together, and all the variables

-(-7b-18)+4=0

We get rid of parentheses

7b+18+4=0

We add all the numbers together, and all the variables

7b+22=0

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

7b=-22

b=-22/7

b=-3+1/7

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