-3=1+2x

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Solution for -3=1+2x equation: 



-3=1+2x

We move all terms to the left:

-3-(1+2x)=0

We add all the numbers together, and all the variables

-(2x+1)-3=0

We get rid of parentheses

-2x-1-3=0

We add all the numbers together, and all the variables

-2x-4=0

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

-2x=4

x=4/-2

x=-2

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