8x-9=21-7x

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Solution for 8x-9=21-7x equation: 



8x-9=21-7x

We move all terms to the left:

8x-9-(21-7x)=0

We add all the numbers together, and all the variables

8x-(-7x+21)-9=0

We get rid of parentheses

8x+7x-21-9=0

We add all the numbers together, and all the variables

15x-30=0

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

15x=30

x=30/15

x=2

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