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400x-5=800x-55
We move all terms to the left:
400x-5-(800x-55)=0
We get rid of parentheses
400x-800x+55-5=0
We add all the numbers together, and all the variables
-400x+50=0
We move all terms containing x to the left, all other terms to the right
-400x=-50
x=-50/-400
x=1/8
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