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7(r+2)=-5(-2r-7)
We move all terms to the left:
7(r+2)-(-5(-2r-7))=0
We multiply parentheses
7r-(-5(-2r-7))+14=0
We calculate terms in parentheses: -(-5(-2r-7)), so:We get rid of parentheses
-5(-2r-7)
We multiply parentheses
10r+35
Back to the equation:
-(10r+35)
7r-10r-35+14=0
We add all the numbers together, and all the variables
-3r-21=0
We move all terms containing r to the left, all other terms to the right
-3r=21
r=21/-3
r=-7
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