21=4(x-1)

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Solution for 21=4(x-1) equation: 



21=4(x-1)

We move all terms to the left:

21-(4(x-1))=0



We calculate terms in parentheses: -(4(x-1)), so:

4(x-1)

We multiply parentheses

4x-4

Back to the equation:

-(4x-4)



We get rid of parentheses

-4x+4+21=0

We add all the numbers together, and all the variables

-4x+25=0

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

-4x=-25

x=-25/-4

x=6+1/4

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