To solve the equation:

\[
-1 + 3r = -19
\]

### Step 1: Isolate the term with the variable (3r).
Add 1 to both sides:

\[
3r = -19 + 1
\]

Simplifying the right side:

\[
3r = -18
\]

### Step 2: Solve for \( r \).
Divide both sides by 3:

\[
r = \frac{-18}{3}
\]

Simplifying:

\[
r = -6
\]

So, the solution is \( r = -6 \).

Would you like more details or have any questions?

Here are 5 related questions:
1. How do you solve equations with variables on both sides?
2. What happens if there's a fraction involved in the equation?
3. How do you solve quadratic equations like \( ax^2 + bx + c = 0 \)?
4. What is the method to solve equations with more than one variable?
5. How do you solve inequalities instead of equations?

**Tip:** Always check your solution by substituting it back into the original equation.

Learn how to solve the linear equation -1 + 3r = -19 with a detailed step-by-step solution. This problem involves isolating the variable, performing operations on both sides, and simplifying terms. Suitable for students in Grades 7-9.

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