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12x-15=15x-3x
We move all terms to the left:
12x-15-(15x-3x)=0
We add all the numbers together, and all the variables
12x-(+12x)-15=0
We get rid of parentheses
12x-12x-15=0
We add all the numbers together, and all the variables
-15!=0
There is no solution for this equation
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