77-31+40=x

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Solution for 77-31+40=x equation: 



77-31+40=x

We move all terms to the left:

77-31+40-(x)=0

We add all the numbers together, and all the variables

-1x+86=0

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

-x=-86

x=-86/-1

x=+86

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