21(x-4)=-84+21x

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Solution for 21(x-4)=-84+21x equation: 



21(x-4)=-84+21x

We move all terms to the left:

21(x-4)-(-84+21x)=0

We add all the numbers together, and all the variables

21(x-4)-(21x-84)=0

We multiply parentheses

21x-(21x-84)-84=0

We get rid of parentheses

21x-21x+84-84=0

We add all the numbers together, and all the variables

=0

x=0/1

x=0

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