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4x+15=x+3x
We move all terms to the left:
4x+15-(x+3x)=0
We add all the numbers together, and all the variables
4x-(+4x)+15=0
We get rid of parentheses
4x-4x+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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