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160=5(-3r+8)
We move all terms to the left:
160-(5(-3r+8))=0
We calculate terms in parentheses: -(5(-3r+8)), so:We get rid of parentheses
5(-3r+8)
We multiply parentheses
-15r+40
Back to the equation:
-(-15r+40)
15r-40+160=0
We add all the numbers together, and all the variables
15r+120=0
We move all terms containing r to the left, all other terms to the right
15r=-120
r=-120/15
r=-8
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