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540=3x+285
We move all terms to the left:
540-(3x+285)=0
We get rid of parentheses
-3x-285+540=0
We add all the numbers together, and all the variables
-3x+255=0
We move all terms containing x to the left, all other terms to the right
-3x=-255
x=-255/-3
x=+85
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