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-200=100x-1200
We move all terms to the left:
-200-(100x-1200)=0
We get rid of parentheses
-100x+1200-200=0
We add all the numbers together, and all the variables
-100x+1000=0
We move all terms containing x to the left, all other terms to the right
-100x=-1000
x=-1000/-100
x=+10
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