Question

решите уравнение
1) (4y - 5)(3y - 1) - (2y - 7)(6y + 7) + 54 = 0;

Answer 1

(4y - 5)(3y - 1) - (2y - 7)(6y + 7) + 54 = 0
12y²-4y-15y+5-(12y²+14y-42y-49)+54=0
12y²-19y+5-12y²+28y+49+54=0
9y+108=0
9y=-108
y=-12