Let's solve the equation step by step and fill in the missing terms and descriptions.
Starting with the original equation:
\[ 10(r + 1) = 20 \]
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Divide both sides by 10 to isolate the expression in parentheses:
\[ r + 1 = \frac{20}{10} \]
This simplifies to:
\[ r + 1 = 2 \]
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Now, we need to solve for \( r \). Subtract 1 from both sides:
\[ r = 2 - 1 \]
Which simplifies to:
\[ r = 1 \]
So, the completed steps are:
- 10(r+1) = 20
- Divide both sides by 10
- r + 1 = 2
- Subtract 1 from both sides
- r = 1
The missing term is \( r = 1 \) and the missing description for that step is "Subtract 1 from both sides."