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3=3x+8x
We move all terms to the left:
3-(3x+8x)=0
We add all the numbers together, and all the variables
-(+11x)+3=0
We get rid of parentheses
-11x+3=0
We move all terms containing x to the left, all other terms to the right
-11x=-3
x=-3/-11
x=3/11
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