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-x-102=213-10x
We move all terms to the left:
-x-102-(213-10x)=0
We add all the numbers together, and all the variables
-x-(-10x+213)-102=0
We add all the numbers together, and all the variables
-1x-(-10x+213)-102=0
We get rid of parentheses
-1x+10x-213-102=0
We add all the numbers together, and all the variables
9x-315=0
We move all terms containing x to the left, all other terms to the right
9x=315
x=315/9
x=35
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