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-2x+100=x-989
We move all terms to the left:
-2x+100-(x-989)=0
We get rid of parentheses
-2x-x+989+100=0
We add all the numbers together, and all the variables
-3x+1089=0
We move all terms containing x to the left, all other terms to the right
-3x=-1089
x=-1089/-3
x=+363
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