-12=7(2(r)-3)-(8r-9)

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Solution for -12=7(2(r)-3)-(8r-9) equation: 



-12=7(2(r)-3)-(8r-9)

We move all terms to the left:

-12-(7(2(r)-3)-(8r-9))=0



We calculate terms in parentheses: -(7(2r-3)-(8r-9)), so:

7(2r-3)-(8r-9)

We multiply parentheses

14r-(8r-9)-21

We get rid of parentheses

14r-8r+9-21

We add all the numbers together, and all the variables

6r-12

Back to the equation:

-(6r-12)



We get rid of parentheses

-6r+12-12=0

We add all the numbers together, and all the variables

-6r=0

r=0/-6

r=0

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