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The answer is 9

Step-by-step explanation:

A linear equation is an equation of a straight line. To solve linear equations, it is important to keep the following key concepts in mind:

Maintain balance of the equation by applying the same operations to both sides of an equation

Isolate for the variable by collecting like terms

Use inverse operations to rearrange an equation

x must be 9 (Answer C).

Step-by-step explanation:

The two angles marked in red are "vertical angles," and, as such, they are equal:  5x - 8 = 2x + 19.

Combining like terms results in 3x = 27, and therefore x must be 9 (Answer C).