The expression you provided is \( 9x + 12x + 4 \). First, let's simplify it by combining like terms:

\[
9x + 12x + 4 = 21x + 4
\]

To find the zeros of this expression, set it equal to zero and solve for \( x \):

\[
21x + 4 = 0
\]

Now, solve for \( x \):

\[
21x = -4
\]

\[
x = -\frac{4}{21}
\]

So, the zero of the expression is \( x = -\frac{4}{21} \).

Would you like more details or have any questions?

Here are 5 related questions to consider:
1. How would you find the zeros of a quadratic expression like \( ax^2 + bx + c \)?
2. What does it mean for a value of \( x \) to be a zero of a function or expression?
3. How can the zero of a linear function be interpreted graphically?
4. What are the steps to solving linear equations with multiple variables?
5. How do you solve an equation if the coefficients involve fractions?

**Tip:** Always double-check the combination of like terms to avoid simple arithmetic mistakes in solving equations.

Learn how to find the zeros of the linear expression 9x + 12x + 4 with a detailed step-by-step solution. This problem involves combining like terms and solving linear equations. Suitable for students in Grades 7-9.

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