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