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-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:We get rid of parentheses
-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)
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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