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7(x-4)=3x+21+4x
We move all terms to the left:
7(x-4)-(3x+21+4x)=0
We add all the numbers together, and all the variables
7(x-4)-(7x+21)=0
We multiply parentheses
7x-(7x+21)-28=0
We get rid of parentheses
7x-7x-21-28=0
We add all the numbers together, and all the variables
-49!=0
There is no solution for this equation
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