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50+55x=45x+200
We move all terms to the left:
50+55x-(45x+200)=0
We get rid of parentheses
55x-45x-200+50=0
We add all the numbers together, and all the variables
10x-150=0
We move all terms containing x to the left, all other terms to the right
10x=150
x=150/10
x=15
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