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x+6x-6=21+7x
We move all terms to the left:
x+6x-6-(21+7x)=0
We add all the numbers together, and all the variables
x+6x-(7x+21)-6=0
We add all the numbers together, and all the variables
7x-(7x+21)-6=0
We get rid of parentheses
7x-7x-21-6=0
We add all the numbers together, and all the variables
-27!=0
There is no solution for this equation
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