21-3x=42+6x

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Solution for 21-3x=42+6x equation: 



21-3x=42+6x

We move all terms to the left:

21-3x-(42+6x)=0

We add all the numbers together, and all the variables

-3x-(6x+42)+21=0

We get rid of parentheses

-3x-6x-42+21=0

We add all the numbers together, and all the variables

-9x-21=0

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

-9x=21

x=21/-9

x=-2+1/3

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