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(r+13)/12=1
We simplify the equation to the form, which is simple to understand
(r+13)/12=1
Reorder the terms in parentheses
( + 0.0833333333333r+1.08333333333)=1
Remove unnecessary parentheses
+ 0.0833333333333r+1.08333333333=1
We move all terms containing r to the left and all other terms to the right.
+ 0.0833333333333r=+1-1.08333333333
We simplify left and right side of the equation.
+ 0.0833333333333r=-0.08333333333
We divide both sides of the equation by 0.0833333333333 to get r.
r=-0.99999999996
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