Question

When you add 18 to 1/4 of a number, you get the number itself.

Answer 1

$\frac{1}{4} x+18=x \ \ \ \ \ /*4 \\ x+72=4x \ \ \ \ /-x \\ 72=3x \\ 3x=72 \ \ \ /:3 \\ x=24$

Answer 2

$\frac{1}{4}x +18=x \\ 18= -\frac{4}{1} x+x \\ 18= \frac{3}{4} x\\ 24= x$