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65=100-x
We move all terms to the left:
65-(100-x)=0
We add all the numbers together, and all the variables
-(-1x+100)+65=0
We get rid of parentheses
1x-100+65=0
We add all the numbers together, and all the variables
x-35=0
We move all terms containing x to the left, all other terms to the right
x=35
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