x+31=3x-11

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Solution for x+31=3x-11 equation: 



x+31=3x-11

We move all terms to the left:

x+31-(3x-11)=0

We get rid of parentheses

x-3x+11+31=0

We add all the numbers together, and all the variables

-2x+42=0

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

-2x=-42

x=-42/-2

x=+21

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