3=1+-2b

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Solution for 3=1+-2b equation: 



3=1+-2b

We move all terms to the left:

3-(1+-2b)=0

We add all the numbers together, and all the variables

-(-2b)+3=0

We get rid of parentheses

2b+3=0

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

2b=-3

b=-3/2

b=-1+1/2

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