21r-6=4(7r-2)

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Solution for 21r-6=4(7r-2) equation: 



21r-6=4(7r-2)

We move all terms to the left:

21r-6-(4(7r-2))=0



We calculate terms in parentheses: -(4(7r-2)), so:

4(7r-2)

We multiply parentheses

28r-8

Back to the equation:

-(28r-8)



We get rid of parentheses

21r-28r+8-6=0

We add all the numbers together, and all the variables

-7r+2=0

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

-7r=-2

r=-2/-7

r=2/7

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