Ответ: x(a-b)+y(b-a)
5 - 9x = 5 - 9 * (-1/3) = 5 + 9/3 = 5 + 3 = 8
2а+123а+97=472;
125a=472-97;
123a=375;
д=16-4*1*(-5)= 16+20=36