5x+7x-21=42-9x

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Solution for 5x+7x-21=42-9x equation: 



5x+7x-21=42-9x

We move all terms to the left:

5x+7x-21-(42-9x)=0

We add all the numbers together, and all the variables

5x+7x-(-9x+42)-21=0

We add all the numbers together, and all the variables

12x-(-9x+42)-21=0

We get rid of parentheses

12x+9x-42-21=0

We add all the numbers together, and all the variables

21x-63=0

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

21x=63

x=63/21

x=3

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