Упростить и решите :
(xy-2x+5y)*3+2(2xy+3x-6y),если x=1 2/7,y=--5/6
Хелп миии

x =1 2/7 =9/7=3xy-6x+15y +4xy+6x-12y ==7xy +3y =y(7x +3) = (-5/6) × (7*(9/7) +3) ==(-5/6) ×(9+3) =(-5/6) ×12 =(-5*12)/6 = -5*2 == -10