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4x-7=12+4x
We move all terms to the left:
4x-7-(12+4x)=0
We add all the numbers together, and all the variables
4x-(4x+12)-7=0
We get rid of parentheses
4x-4x-12-7=0
We add all the numbers together, and all the variables
-19!=0
There is no solution for this equation
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