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-r/12+11=12
We simplify the equation to the form, which is simple to understand
-r/12+11=12
We move all terms containing r to the left and all other terms to the right.
-0.083333333333333r=+12-11
We simplify left and right side of the equation.
-0.083333333333333r=+1
We divide both sides of the equation by -0.083333333333333 to get r.
r=-12
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