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3.3=x+3x
We move all terms to the left:
3.3-(x+3x)=0
We add all the numbers together, and all the variables
-(+4x)+3.3=0
We get rid of parentheses
-4x+3.3=0
We move all terms containing x to the left, all other terms to the right
-4x=-3.3
x=-3.3/-4
x=2.5384615384615/3.0769230769231
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