Can you explain to me how that is?

TEST STRING: (69,138)(80,1310)(30,40)

Show me the math on that test string to get a smallest common denominator of 524 please.

Here is a wolfram link showing the Least Common Multiple for 138, 1310, and 40 (the denominators from the test case):
https://www.wolframalpha.com/input/?i=least+common+denominator&rawformassumption=%7B%22F%22,+%22LCM%22,+%22commonnumbers%22%7D+-%3E%22(138,1310,40)%22&rawformassumption=%7B%22C%22,+%22least+common+denominator%22%7D+-%3E+%7B%22Calculator%22%7D

My PHP Solution is giving me an error as well and it seems to be the same as Sardis93's.

My attempt echo's each test run's input:

TEST STRING: (1,2)(1,3)(1,4)
TEST STRING: (69,130)(87,1310)(3,4)
TEST STRING: (77,130)(84,131)(3,4)
TEST STRING: (6,13)(187,1310)(31,41)
TEST STRING: (8,15)(7,111)(4,25)
TEST STRING: (1,100)(3,1000)(1,2500)(1,20000)
TEST STRING: (1,1)(3,1)(4,1)(5,1)
TEST STRING: (69,138)(80,1310)(30,40)

everything works as expected until that last test case it errors, giving me:

✘ Failed asserting that two strings are equal.
Expected: '(262,524)(32,524)(393,524)'
Actual  : '(180780,361560)(22080,361560)(271170,361560)'

This is certainly a bug in the Kata I would think. That last test just doesn't check out.

Please take a look @g964