-31+x=21-3x

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Solution for -31+x=21-3x equation: 



-31+x=21-3x

We move all terms to the left:

-31+x-(21-3x)=0

We add all the numbers together, and all the variables

x-(-3x+21)-31=0

We get rid of parentheses

x+3x-21-31=0

We add all the numbers together, and all the variables

4x-52=0

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

4x=52

x=52/4

x=13

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