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-1(r+1)-2=2+r-1
We simplify the equation to the form, which is simple to understand
-1(r+1)-2=2+r-1
Reorder the terms in parentheses
+(-1r-1)-2=2+r-1
Remove unnecessary parentheses
-1r-1-2=+2+r-1
We move all terms containing r to the left and all other terms to the right.
-1r-1r=+2-1+1+2
We simplify left and right side of the equation.
-2r=+4
We divide both sides of the equation by -2 to get r.
r=-2
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