помогите плизз:все задания!!!

1)
a) =-3a - 6b - 7a + 1,4b= -10a - 4,6b
б) = 1,52a - 7,5a + 12b = -5,98a + 12b

2)
a)
-3x - 14 - 7x = 14x + 5
-10x - 14 = 14x + 5
-10x - 14x = 5 + 14
-24x = 19
x = -19:24
x= -19/24

б)

1 2/3x - 2x = 51 + 9
-1/3x = 60
x = 60 *(-3)
x=-180

3)
a) = 4,5 : 18 + 3,5 = 0,25 + 3,5 = 3,75
б) = -9 + 11,61= 2,61