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-9=-3(r+20)
We move all terms to the left:
-9-(-3(r+20))=0
We calculate terms in parentheses: -(-3(r+20)), so:We get rid of parentheses
-3(r+20)
We multiply parentheses
-3r-60
Back to the equation:
-(-3r-60)
3r+60-9=0
We add all the numbers together, and all the variables
3r+51=0
We move all terms containing r to the left, all other terms to the right
3r=-51
r=-51/3
r=-17
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