B=4-x

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Solution for B=4-x equation: 



=4-B

We move all terms to the left:

-(4-B)=0

We add all the numbers together, and all the variables

-(-1B+4)=0

We get rid of parentheses

1B-4=0

We add all the numbers together, and all the variables

B-4=0

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

B=4

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