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55+2x=100+x
We move all terms to the left:
55+2x-(100+x)=0
We add all the numbers together, and all the variables
2x-(x+100)+55=0
We get rid of parentheses
2x-x-100+55=0
We add all the numbers together, and all the variables
x-45=0
We move all terms containing x to the left, all other terms to the right
x=45
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