21=7(8-x)

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Solution for 21=7(8-x) equation: 



21=7(8-x)

We move all terms to the left:

21-(7(8-x))=0

We add all the numbers together, and all the variables

-(7(-1x+8))+21=0



We calculate terms in parentheses: -(7(-1x+8)), so:

7(-1x+8)

We multiply parentheses

-7x+56

Back to the equation:

-(-7x+56)



We get rid of parentheses

7x-56+21=0

We add all the numbers together, and all the variables

7x-35=0

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

7x=35

x=35/7

x=5

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