12x+21-9x=-21-4x

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Solution for 12x+21-9x=-21-4x equation: 



12x+21-9x=-21-4x

We move all terms to the left:

12x+21-9x-(-21-4x)=0

We add all the numbers together, and all the variables

12x-9x-(-4x-21)+21=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

3x+4x+21+21=0

We add all the numbers together, and all the variables

7x+42=0

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

7x=-42

x=-42/7

x=-6

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