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10=x+20-30
We move all terms to the left:
10-(x+20-30)=0
We add all the numbers together, and all the variables
-(x-10)+10=0
We get rid of parentheses
-x+10+10=0
We add all the numbers together, and all the variables
-1x+20=0
We move all terms containing x to the left, all other terms to the right
-x=-20
x=-20/-1
x=+20
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