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4=r/2+1
We simplify the equation to the form, which is simple to understand
4=r/2+1
We move all terms containing r to the left and all other terms to the right.
-0.5r=+1-4
We simplify left and right side of the equation.
-0.5r=-3
We divide both sides of the equation by -00.5 to get r.
r=6
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