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12=r/3+16
We simplify the equation to the form, which is simple to understand
12=r/3+16
We move all terms containing r to the left and all other terms to the right.
-0.33333333333333r=+16-12
We simplify left and right side of the equation.
-0.33333333333333r=+4
We divide both sides of the equation by -00.33333333333333 to get r.
r=-12
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