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8=4r+4-2r
We simplify the equation to the form, which is simple to understand
8=4r+4-2r
We move all terms containing r to the left and all other terms to the right.
-4r+2r=+4-8
We simplify left and right side of the equation.
-2r=-4
We divide both sides of the equation by -2 to get r.
r=2
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