-84=42+21x

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Solution for -84=42+21x equation: 



-84=42+21x

We move all terms to the left:

-84-(42+21x)=0

We add all the numbers together, and all the variables

-(21x+42)-84=0

We get rid of parentheses

-21x-42-84=0

We add all the numbers together, and all the variables

-21x-126=0

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

-21x=126

x=126/-21

x=-6

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