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21+5x=15+11x-6x
We move all terms to the left:
21+5x-(15+11x-6x)=0
We add all the numbers together, and all the variables
5x-(5x+15)+21=0
We get rid of parentheses
5x-5x-15+21=0
We add all the numbers together, and all the variables
6!=0
There is no solution for this equation
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