-9х-8+8х-5х+2=-10х
-6х-6+10х=0
4х-6=0
4х=6
х=6/4
х=3/2
х=1,5
№1
d^2 - 2d - 5d + 10 - d^2 - 4 = 7d + 6
№2
574 * 100 : 18 = 3189
Ответ:3189
№3
( 2d + 3 y + 3d - 2y) / (d - 3y + d - 3y) = d(2 + 3) + y(3 - 2) / d(1 - 1) - 3y ( 1 - 1) =
= (3 - 2)(-d + y) / (1 - 1 )( d - 3y)
(4a-7)(5a+6b)=20a²+24ab-35a-42b