21=8x+5-4

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Solution for 21=8x+5-4 equation: 



21=8x+5-4

We move all terms to the left:

21-(8x+5-4)=0

We add all the numbers together, and all the variables

-(8x+1)+21=0

We get rid of parentheses

-8x-1+21=0

We add all the numbers together, and all the variables

-8x+20=0

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

-8x=-20

x=-20/-8

x=2+1/2

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