84=3x+21

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Solution for 84=3x+21 equation: 



84=3x+21

We move all terms to the left:

84-(3x+21)=0

We get rid of parentheses

-3x-21+84=0

We add all the numbers together, and all the variables

-3x+63=0

We move all terms containing x to the left, all other terms to the right

-3x=-63

x=-63/-3

x=+21

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