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r-2+r=-2
We simplify the equation to the form, which is simple to understand
r-2+r=-2
We move all terms containing r to the left and all other terms to the right.
+1r+1r=-2+2
We simplify left and right side of the equation.
+2r=0
We divide both sides of the equation by 2 to get r.
r=0
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