21-(x-9)=7x-4

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Solution for 21-(x-9)=7x-4 equation: 



21-(x-9)=7x-4

We move all terms to the left:

21-(x-9)-(7x-4)=0

We get rid of parentheses

-x-7x+9+4+21=0

We add all the numbers together, and all the variables

-8x+34=0

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

-8x=-34

x=-34/-8

x=4+1/4

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