3x+x+21=x+9+5x

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Solution for 3x+x+21=x+9+5x equation: 



3x+x+21=x+9+5x

We move all terms to the left:

3x+x+21-(x+9+5x)=0

We add all the numbers together, and all the variables

3x+x-(6x+9)+21=0

We add all the numbers together, and all the variables

4x-(6x+9)+21=0

We get rid of parentheses

4x-6x-9+21=0

We add all the numbers together, and all the variables

-2x+12=0

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

-2x=-12

x=-12/-2

x=+6

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