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2700=100x+1200
We move all terms to the left:
2700-(100x+1200)=0
We get rid of parentheses
-100x-1200+2700=0
We add all the numbers together, and all the variables
-100x+1500=0
We move all terms containing x to the left, all other terms to the right
-100x=-1500
x=-1500/-100
x=+15
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