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-(r+8)=12-5r
We simplify the equation to the form, which is simple to understand
-(r+8)=12-5r
Remove unnecessary parentheses
-1r-8=12-5r
We move all terms containing r to the left and all other terms to the right.
-1r+5r=+12+8
We simplify left and right side of the equation.
+4r=+20
We divide both sides of the equation by 4 to get r.
r=5
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