7=21-4x

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Solution for 7=21-4x equation: 



7=21-4x

We move all terms to the left:

7-(21-4x)=0

We add all the numbers together, and all the variables

-(-4x+21)+7=0

We get rid of parentheses

4x-21+7=0

We add all the numbers together, and all the variables

4x-14=0

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

4x=14

x=14/4

x=3+1/2

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