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-2-3r=-2(r+5)
We move all terms to the left:
-2-3r-(-2(r+5))=0
We calculate terms in parentheses: -(-2(r+5)), so:We get rid of parentheses
-2(r+5)
We multiply parentheses
-2r-10
Back to the equation:
-(-2r-10)
-3r+2r+10-2=0
We add all the numbers together, and all the variables
-1r+8=0
We move all terms containing r to the left, all other terms to the right
-r=-8
r=-8/-1
r=+8
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