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18-(-x)=20
We move all terms to the left:
18-(-x)-(20)=0
We add all the numbers together, and all the variables
-(-1x)+18-20=0
We add all the numbers together, and all the variables
-(-1x)-2=0
We get rid of parentheses
1x-2=0
We add all the numbers together, and all the variables
x-2=0
We move all terms containing x to the left, all other terms to the right
x=2
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