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2100=100*x
We move all terms to the left:
2100-(100*x)=0
We add all the numbers together, and all the variables
-(+100x)+2100=0
We get rid of parentheses
-100x+2100=0
We move all terms containing x to the left, all other terms to the right
-100x=-2100
x=-2100/-100
x=+21
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