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30=68+x
We move all terms to the left:
30-(68+x)=0
We add all the numbers together, and all the variables
-(x+68)+30=0
We get rid of parentheses
-x-68+30=0
We add all the numbers together, and all the variables
-1x-38=0
We move all terms containing x to the left, all other terms to the right
-x=38
x=38/-1
x=-38
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