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-31=-3(r+8)
We move all terms to the left:
-31-(-3(r+8))=0
We calculate terms in parentheses: -(-3(r+8)), so:We get rid of parentheses
-3(r+8)
We multiply parentheses
-3r-24
Back to the equation:
-(-3r-24)
3r+24-31=0
We add all the numbers together, and all the variables
3r-7=0
We move all terms containing r to the left, all other terms to the right
3r=7
r=7/3
r=2+1/3
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