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130=-5(6r+4)
We move all terms to the left:
130-(-5(6r+4))=0
We calculate terms in parentheses: -(-5(6r+4)), so:We get rid of parentheses
-5(6r+4)
We multiply parentheses
-30r-20
Back to the equation:
-(-30r-20)
30r+20+130=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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