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-26-2r=-5(r+7)
We move all terms to the left:
-26-2r-(-5(r+7))=0
We calculate terms in parentheses: -(-5(r+7)), so:We get rid of parentheses
-5(r+7)
We multiply parentheses
-5r-35
Back to the equation:
-(-5r-35)
-2r+5r+35-26=0
We add all the numbers together, and all the variables
3r+9=0
We move all terms containing r to the left, all other terms to the right
3r=-9
r=-9/3
r=-3
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