-7(-3n+)=-21+21n

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Solution for -7(-3n+)=-21+21n equation: 



-7(-3n+)=-21+21n

We move all terms to the left:

-7(-3n+)-(-21+21n)=0

We add all the numbers together, and all the variables

-7(-3n)-(21n-21)=0

We multiply parentheses

21n-(21n-21)=0

We get rid of parentheses

21n-21n+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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