4r+21=r-8(4-7)

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Solution for 4r+21=r-8(4-7) equation: 



4r+21=r-8(4-7)

We move all terms to the left:

4r+21-(r-8(4-7))=0

We add all the numbers together, and all the variables

4r-(r-8(-3))+21=0



We calculate terms in parentheses: -(r-8(-3)), so:

r-8(-3)

We add all the numbers together, and all the variables

r+24

Back to the equation:

-(r+24)



We get rid of parentheses

4r-r-24+21=0

We add all the numbers together, and all the variables

3r-3=0

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

3r=3

r=3/3

r=1

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