ok so i'm using the notation (n r) for a pascal term

state numbers a, b and c such that

a*(8 5)=b*(8 6)=c*(7 5)

i thought this should be easy: i made three separate equation and developed the pascal terms into factorials like (8 5) = 8!/5!*3! = 8x7x6/2x3 but i just end up with stuff i don't know how to develop. how would you do this? i think there's just something simple im missing