1) 5а+4а= 225-81
9а = 144
а= 16
2) -7х-9х= 26-10
-16х = 16
х= - 1
3) 24х + 40 = 36х + 12
24х - 36х = 12- 40
-12 х= - 28
х = 7/3
4) 9х+ 1 - 21 = 24х+ 15
9х-24х = 15-1+21
-15х = 35
Х = - 7/3
1) 5а+4а= 225-81
9а = 144
а= 16
2) -7х-9х= 26-10
-16х = 16
х= - 1
3) 24х + 40 = 36х + 12
24х - 36х = 12- 40
-12 х= - 28
х = 7/3
4) 9х+ 1 - 21 = 24х+ 15
9х-24х = 15-1+21
-15х = 35
Х = - 7/3