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100=10x-200=+100
We move all terms to the left:
100-(10x-200)=0
We get rid of parentheses
-10x+200+100=0
We add all the numbers together, and all the variables
-10x+300=0
We move all terms containing x to the left, all other terms to the right
-10x=-300
x=-300/-10
x=+30
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