Question

I am thinking of a number. When I multiply my number by 5 and then add 3 I get back my original number. What is my number?

Answer 1

5X + 3 = X

Subtract both sides by X

4X + 3 = 0

Subtract both sides by 3

4X = -3

Divide both sides by 4

X = -3/4

X = -0.75

Check:

-0.75 x 5 = -3.75

-3.75 + 3 = -0.75