7x+21=3+6x

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Solution for 7x+21=3+6x equation: 



7x+21=3+6x

We move all terms to the left:

7x+21-(3+6x)=0

We add all the numbers together, and all the variables

7x-(6x+3)+21=0

We get rid of parentheses

7x-6x-3+21=0

We add all the numbers together, and all the variables

x+18=0

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

x=-18

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