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r/3-3=1
We simplify the equation to the form, which is simple to understand
r/3-3=1
We move all terms containing r to the left and all other terms to the right.
+ 0.33333333333333r=+1+3
We simplify left and right side of the equation.
+ 0.33333333333333r=+4
We divide both sides of the equation by 0.33333333333333 to get r.
r=12
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