3x+21=8+4x

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Solution for 3x+21=8+4x equation: 



3x+21=8+4x

We move all terms to the left:

3x+21-(8+4x)=0

We add all the numbers together, and all the variables

3x-(4x+8)+21=0

We get rid of parentheses

3x-4x-8+21=0

We add all the numbers together, and all the variables

-1x+13=0

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

-x=-13

x=-13/-1

x=+13

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