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846=x+2x+6x
We move all terms to the left:
846-(x+2x+6x)=0
We add all the numbers together, and all the variables
-(+9x)+846=0
We get rid of parentheses
-9x+846=0
We move all terms containing x to the left, all other terms to the right
-9x=-846
x=-846/-9
x=+94
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