-12(r-9)-4r=-4(r-9)

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Solution for -12(r-9)-4r=-4(r-9) equation: 



-12(r-9)-4r=-4(r-9)

We move all terms to the left:

-12(r-9)-4r-(-4(r-9))=0

We add all the numbers together, and all the variables

-4r-12(r-9)-(-4(r-9))=0

We multiply parentheses

-4r-12r-(-4(r-9))+108=0



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

-4(r-9)

We multiply parentheses

-4r+36

Back to the equation:

-(-4r+36)



We add all the numbers together, and all the variables

-16r-(-4r+36)+108=0

We get rid of parentheses

-16r+4r-36+108=0

We add all the numbers together, and all the variables

-12r+72=0

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

-12r=-72

r=-72/-12

r=+6

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