42=18-4b

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Solution for 42=18-4b equation: 



42=18-4b

We move all terms to the left:

42-(18-4b)=0

We add all the numbers together, and all the variables

-(-4b+18)+42=0

We get rid of parentheses

4b-18+42=0

We add all the numbers together, and all the variables

4b+24=0

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

4b=-24

b=-24/4

b=-6

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