-3x + 2 (- 3Y + 7x) - 6 (X-Y) - 10Y, where x = 1 / 2, y = 1 / 3

-3x + 2 (- 3Y + 7x) - 6 (X-Y) - 10Y, where x = 1 / 2, y = 1 / 3

-3x+2(-3y+7x)-6(x-y)-10y
=-3x-6y+14x-6x+6y-10y
=5x-10y, where x = 1 / 2, y = 1 / 3
=5/2-10/3
=15/6-20/6
=-5/6