7=3-b

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Solution for 7=3-b equation: 



7=3-b

We move all terms to the left:

7-(3-b)=0

We add all the numbers together, and all the variables

-(-1b+3)+7=0

We get rid of parentheses

1b-3+7=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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