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-1-(5-r)=13+2r
We simplify the equation to the form, which is simple to understand
-1-(5-r)=13+2r
Remove unnecessary parentheses
-1-5+1r=13+2r
We move all terms containing r to the left and all other terms to the right.
+1r-2r=+13+1+5
We simplify left and right side of the equation.
-1r=+19
We divide both sides of the equation by -1 to get r.
r=-19
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