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24.5+7r=-3.5(3r-2)
We move all terms to the left:
24.5+7r-(-3.5(3r-2))=0
We calculate terms in parentheses: -(-3.5(3r-2)), so:We get rid of parentheses
-3.5(3r-2)
We multiply parentheses
-10.5r+7
Back to the equation:
-(-10.5r+7)
7r+10.5r-7+24.5=0
We add all the numbers together, and all the variables
17.5r+17.5=0
We move all terms containing r to the left, all other terms to the right
17.5r=-17.5
r=-17.5/17.5
r=-1
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