31=13+x

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Solution for 31=13+x equation:



31=13+x
We move all terms to the left:
31-(13+x)=0
We add all the numbers together, and all the variables
-(x+13)+31=0
We get rid of parentheses
-x-13+31=0
We add all the numbers together, and all the variables
-1x+18=0
We move all terms containing x to the left, all other terms to the right
-x=-18
x=-18/-1
x=+18

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