If f(x)=-5 find the value of x

f(x) is a fancy way to say y

The equation says y=05, so x is ungiven based on what you have given us. Please check if there was more information written as usually its written as

Example: f(x)=3x+5

correct

step-by-step explanation:

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so: