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(7x-6x)+(3x+9x)=
We move all terms to the left:
(7x-6x)+(3x+9x)-()=0
We add all the numbers together, and all the variables
(+x)+(+12x)-()=0
We add all the numbers together, and all the variables
(+x)+(+12x)=0
We get rid of parentheses
x+12x=0
We add all the numbers together, and all the variables
13x=0
x=0/13
x=0
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