Question

find the value of x.

Explanation:

Step1: Sumar los ángulos

$$42 + 4x = 90$$

Step2: Resolver para \(x\)

Restar \(42\) de ambos lados:
$$4x = 90 - 42$$
$$4x = 48$$
Dividir por \(4\):
$$x = \frac{48}{4}$$
$$x = 12$$

Answer:

\(12\)