(x-24)*6=y

x=4872 y=29088

Set the X-axis screw and Y-axis screw rules.

X+y=42 100x=75y solution x= 18 y=24.

Let a ***x b ***y rule.

X:y=2:5 x-2.5=(y-2.5)/2-2 solution x=3 y=7.5.