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r-9+10=0
We simplify the equation to the form, which is simple to understand
r-9+10=0
We move all terms containing r to the left and all other terms to the right.
+1r=0+9-10
We simplify left and right side of the equation.
+1r=-1
We divide both sides of the equation by 1 to get r.
r=-1
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