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r/13=-12
We simplify the equation to the form, which is simple to understand
r/13=-12
Simplifying:
+ 0.0769230769231r=-12
We move all terms containing r to the left and all other terms to the right.
+ 0.0769230769231r=-12
We simplify left and right side of the equation.
+ 0.0769230769231r=-12
We divide both sides of the equation by 0.0769230769231 to get r.
r=-156
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