-12r+8r=-4(r-6)-3(r-9)

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Solution for -12r+8r=-4(r-6)-3(r-9) equation: 



-12r+8r=-4(r-6)-3(r-9)

We move all terms to the left:

-12r+8r-(-4(r-6)-3(r-9))=0

We add all the numbers together, and all the variables

-4r-(-4(r-6)-3(r-9))=0



We calculate terms in parentheses: -(-4(r-6)-3(r-9)), so:

-4(r-6)-3(r-9)

We multiply parentheses

-4r-3r+24+27

We add all the numbers together, and all the variables

-7r+51

Back to the equation:

-(-7r+51)



We get rid of parentheses

-4r+7r-51=0

We add all the numbers together, and all the variables

3r-51=0

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

3r=51

r=51/3

r=17

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