31-x=-12

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Solution for 31-x=-12 equation: 



31-x=-12

We move all terms to the left:

31-x-(-12)=0

We add all the numbers together, and all the variables

-1x+43=0

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

-x=-43

x=-43/-1

x=+43

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