3=13+b

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Solution for 3=13+b equation: 



3=13+b

We move all terms to the left:

3-(13+b)=0

We add all the numbers together, and all the variables

-(b+13)+3=0

We get rid of parentheses

-b-13+3=0

We add all the numbers together, and all the variables

-1b-10=0

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

-b=10

b=10/-1

b=-10

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