9x+21=5-7x

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



9x+21=5-7x

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

9x+7x-5+21=0

We add all the numbers together, and all the variables

16x+16=0

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

16x=-16

x=-16/16

x=-1

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