What is the smallest two-digit prime that is the sum of three (not necessarily distinct) positive perfect cubes?

where is the triangle?

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:

1/3 + 1/5 = 8/15.

step-by-step explanation:

hope it