100-x=x+31

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Solution for 100-x=x+31 equation: 



100-x=x+31

We move all terms to the left:

100-x-(x+31)=0

We add all the numbers together, and all the variables

-1x-(x+31)+100=0

We get rid of parentheses

-1x-x-31+100=0

We add all the numbers together, and all the variables

-2x+69=0

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

-2x=-69

x=-69/-2

x=34+1/2

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