21=14-7x

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Solution for 21=14-7x equation: 



21=14-7x

We move all terms to the left:

21-(14-7x)=0

We add all the numbers together, and all the variables

-(-7x+14)+21=0

We get rid of parentheses

7x-14+21=0

We add all the numbers together, and all the variables

7x+7=0

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

7x=-7

x=-7/7

x=-1

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