If x-2y = 5, then the value of 5 (2y-x) ^ 2-3 (2y-x) - 60 is

If x-2y = 5, then the value of 5 (2y-x) ^ 2-3 (2y-x) - 60 is

x-2y=5
2y-x=-5
5(2y-x)^2-3(2y-x)-60=5(-5)^2-3*(-5)-60=5*25+15-60=80