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20-5r=20-r
We simplify the equation to the form, which is simple to understand
20-5r=20-r
We move all terms containing r to the left and all other terms to the right.
-5r+1r=+20-20
We simplify left and right side of the equation.
-4r=0
We divide both sides of the equation by -4 to get r.
r=-0
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