Question

(1/4 +1/5 + 1/x )=6 ,then what is the value of x?

Answer 1

x= -20/111 .. . . . ....

Answer 2

$\frac{1}{4} + \frac{1}{5} + \frac{1}{x} = 6 \\ \\ \frac{5x + 4x + 20}{20x} = 6 \\ \\ \frac{9x + 20}{20x} = \frac{6}{1} \\ \\ 9x + 20 = 6(20x) \\ \\ 9x + 20 = 120x \\ \\ 120x - 9x = 20 \\ \\ 111x = 20 \\ \\ x = \frac{20}{111}$