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20=r+1120=r+11

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Full solution

Q. 20=r+1120=r+11
  1. Isolate the variable: Subtract 1111 from both sides of the equation to isolate the variable rr. \newline20=r+1120 = r + 11\newline20−11=r+11−1120 - 11 = r + 11 - 11
  2. Perform subtraction: Perform the subtraction on both sides.\newline20−11=r20 - 11 = r\newline9=r9 = r
  3. Check the solution: Check the solution by substituting rr back into the original equation.20=9+1120 = 9 + 1120=2020 = 20

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