4x+2x-21=8x-5x+9

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Solution for 4x+2x-21=8x-5x+9 equation: 



4x+2x-21=8x-5x+9

We move all terms to the left:

4x+2x-21-(8x-5x+9)=0

We add all the numbers together, and all the variables

4x+2x-(3x+9)-21=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

6x-3x-9-21=0

We add all the numbers together, and all the variables

3x-30=0

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

3x=30

x=30/3

x=10

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