Given equation: We are given the equation 20=r+11. To find the value of r, we need to isolate r on one side of the equation. We can do this by subtracting 11 from both sides of the equation.Calculation: 20−11=r+11−11
Isolating r: After performing the subtraction, we get the equation 9=r.This shows that r is equal to 9.
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