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3.5=x+2x
We move all terms to the left:
3.5-(x+2x)=0
We add all the numbers together, and all the variables
-(+3x)+3.5=0
We get rid of parentheses
-3x+3.5=0
We move all terms containing x to the left, all other terms to the right
-3x=-3.5
x=-3.5/-3
x=1+0.5/3
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