Question

The function f(x) = 2x + 3x + 5, when evaluated , gives a value of 19. What is the functions input value?

Answer 1

The qurstion can be written as
f(x) is equal to 19 at a certain x.what is that x?
19=2x+3x+5
19=5x+5
14=5x
$x = \frac{14}{5}$