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3(x-)=-21+3x

We move all terms to the left:

3(x-)-(-21+3x)=0

We add all the numbers together, and all the variables

3(+x)-(3x-21)=0

We multiply parentheses

3x-(3x-21)=0

We get rid of parentheses

3x-3x+21=0

We add all the numbers together, and all the variables

21!=0

There is no solution for this equation

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