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3x=1x*12
We move all terms to the left:
3x-(1x*12)=0
We add all the numbers together, and all the variables
3x-(+1x*12)=0
We get rid of parentheses
3x-1x*12=0
Wy multiply elements
3x-12x=0
We add all the numbers together, and all the variables
-9x=0
x=0/-9
x=0
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