8+9+x=31-12

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Solution for 8+9+x=31-12 equation: 



8+9+x=31-12

We move all terms to the left:

8+9+x-(31-12)=0

We add all the numbers together, and all the variables

x+8+9-19=0

We add all the numbers together, and all the variables

x-2=0

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

x=2

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