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2=-1+x-18
We move all terms to the left:
2-(-1+x-18)=0
We add all the numbers together, and all the variables
-(x-19)+2=0
We get rid of parentheses
-x+19+2=0
We add all the numbers together, and all the variables
-1x+21=0
We move all terms containing x to the left, all other terms to the right
-x=-21
x=-21/-1
x=+21
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