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-4=r*20-5
We simplify the equation to the form, which is simple to understand
-4=r*20-5
We move all terms containing r to the left and all other terms to the right.
-20r=-5+4
We simplify left and right side of the equation.
-20r=-1
We divide both sides of the equation by -020 to get r.
r=0.05
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