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180=-6(5r-5)
We move all terms to the left:
180-(-6(5r-5))=0
We calculate terms in parentheses: -(-6(5r-5)), so:We get rid of parentheses
-6(5r-5)
We multiply parentheses
-30r+30
Back to the equation:
-(-30r+30)
30r-30+180=0
We add all the numbers together, and all the variables
30r+150=0
We move all terms containing r to the left, all other terms to the right
30r=-150
r=-150/30
r=-5
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