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3x+2.5=12x-3x+2.5
We move all terms to the left:
3x+2.5-(12x-3x+2.5)=0
We add all the numbers together, and all the variables
3x-(9x+2.5)+2.5=0
We get rid of parentheses
3x-9x-2.5+2.5=0
We add all the numbers together, and all the variables
-6x=0
x=0/-6
x=0
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