21-7r=4(1-6r)

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Solution for 21-7r=4(1-6r) equation: 



21-7r=4(1-6r)

We move all terms to the left:

21-7r-(4(1-6r))=0

We add all the numbers together, and all the variables

-7r-(4(-6r+1))+21=0



We calculate terms in parentheses: -(4(-6r+1)), so:

4(-6r+1)

We multiply parentheses

-24r+4

Back to the equation:

-(-24r+4)



We get rid of parentheses

-7r+24r-4+21=0

We add all the numbers together, and all the variables

17r+17=0

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

17r=-17

r=-17/17

r=-1

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