21+8r=3(5r-3)-5

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Solution for 21+8r=3(5r-3)-5 equation: 



21+8r=3(5r-3)-5

We move all terms to the left:

21+8r-(3(5r-3)-5)=0



We calculate terms in parentheses: -(3(5r-3)-5), so:

3(5r-3)-5

We multiply parentheses

15r-9-5

We add all the numbers together, and all the variables

15r-14

Back to the equation:

-(15r-14)



We get rid of parentheses

8r-15r+14+21=0

We add all the numbers together, and all the variables

-7r+35=0

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

-7r=-35

r=-35/-7

r=+5

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