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500+2r=2800
We simplify the equation to the form, which is simple to understand
500+2r=2800
We move all terms containing r to the left and all other terms to the right.
+2r=+2800-500
We simplify left and right side of the equation.
+2r=+2300
We divide both sides of the equation by 2 to get r.
r=1150
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