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100x+(100x+600)=2500
We move all terms to the left:
100x+(100x+600)-(2500)=0
We get rid of parentheses
100x+100x+600-2500=0
We add all the numbers together, and all the variables
200x-1900=0
We move all terms containing x to the left, all other terms to the right
200x=1900
x=1900/200
x=9+1/2
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