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45=255-x
We move all terms to the left:
45-(255-x)=0
We add all the numbers together, and all the variables
-(-1x+255)+45=0
We get rid of parentheses
1x-255+45=0
We add all the numbers together, and all the variables
x-210=0
We move all terms containing x to the left, all other terms to the right
x=210
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