-6r+8r=-9(r-1)-3(-4r+7)

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Solution for -6r+8r=-9(r-1)-3(-4r+7) equation: 



-6r+8r=-9(r-1)-3(-4r+7)

We move all terms to the left:

-6r+8r-(-9(r-1)-3(-4r+7))=0

We add all the numbers together, and all the variables

2r-(-9(r-1)-3(-4r+7))=0



We calculate terms in parentheses: -(-9(r-1)-3(-4r+7)), so:

-9(r-1)-3(-4r+7)

We multiply parentheses

-9r+12r+9-21

We add all the numbers together, and all the variables

3r-12

Back to the equation:

-(3r-12)



We get rid of parentheses

2r-3r+12=0

We add all the numbers together, and all the variables

-1r+12=0

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

-r=-12

r=-12/-1

r=+12

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