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