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3x+6=9x-12.
We move all terms to the left:
3x+6-(9x-12.)=0
We add all the numbers together, and all the variables
3x-(9x-12)+6=0
We get rid of parentheses
3x-9x+12+6=0
We add all the numbers together, and all the variables
-6x+18=0
We move all terms containing x to the left, all other terms to the right
-6x=-18
x=-18/-6
x=+3
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