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-7(r+7)+8r=-4(r-4)
We move all terms to the left:
-7(r+7)+8r-(-4(r-4))=0
We add all the numbers together, and all the variables
8r-7(r+7)-(-4(r-4))=0
We multiply parentheses
8r-7r-(-4(r-4))-49=0
We calculate terms in parentheses: -(-4(r-4)), so:We add all the numbers together, and all the variables
-4(r-4)
We multiply parentheses
-4r+16
Back to the equation:
-(-4r+16)
r-(-4r+16)-49=0
We get rid of parentheses
r+4r-16-49=0
We add all the numbers together, and all the variables
5r-65=0
We move all terms containing r to the left, all other terms to the right
5r=65
r=65/5
r=13
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