21-4=2(6-7r)

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



21-4=2(6-7r)

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

-(2(-7r+6))+17=0



We calculate terms in parentheses: -(2(-7r+6)), so:

2(-7r+6)

We multiply parentheses

-14r+12

Back to the equation:

-(-14r+12)



We get rid of parentheses

14r-12+17=0

We add all the numbers together, and all the variables

14r+5=0

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

14r=-5

r=-5/14

r=-5/14

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