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435=2x+x
We move all terms to the left:
435-(2x+x)=0
We add all the numbers together, and all the variables
-(+3x)+435=0
We get rid of parentheses
-3x+435=0
We move all terms containing x to the left, all other terms to the right
-3x=-435
x=-435/-3
x=+145
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