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21+3x=8-31
We move all terms to the left:
21+3x-(8-31)=0
We add all the numbers together, and all the variables
3x+21-(-23)=0
We add all the numbers together, and all the variables
3x+44=0
We move all terms containing x to the left, all other terms to the right
3x=-44
x=-44/3
x=-14+2/3
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