2x+21=4x+5x

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Solution for 2x+21=4x+5x equation: 



2x+21=4x+5x

We move all terms to the left:

2x+21-(4x+5x)=0

We add all the numbers together, and all the variables

2x-(+9x)+21=0

We get rid of parentheses

2x-9x+21=0

We add all the numbers together, and all the variables

-7x+21=0

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

-7x=-21

x=-21/-7

x=+3

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