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1-8=623-x
We move all terms to the left:
1-8-(623-x)=0
We add all the numbers together, and all the variables
-(-1x+623)+1-8=0
We add all the numbers together, and all the variables
-(-1x+623)-7=0
We get rid of parentheses
1x-623-7=0
We add all the numbers together, and all the variables
x-630=0
We move all terms containing x to the left, all other terms to the right
x=630
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