помогите пожалуйста!!!

11) 7/4=x/2
x=(7*2)/4
x=14/4
x=3,5
12) x+3=(4*12)/3
x+3=48/3
x+3=16
x=16-3
x=13
14)0,4x-6=0,6x-9
0,6x-0,4x=9-6
0,2x=3
x=3/0,2
x=15
16)x+1 2/3=-1,2/0,6
x+1 2/3=-2
x=-2-1 2/3
x=-3 2/3
17)x+9 3/11=-68/-3,4
x+9 3/11=20
x=20-9 3/11
x=10 8/11

11)

4x= 7*2

4x = 14

x = 14:4

x = 3,5

12)

3*(x+3)=12*4

3x + 9 = 48

3x = 48-9

3x = 39

x = 39:3

x = 13

14)

0,6x - 0,4x = 9 - 6

0,2x = 3

x = 3 : 0,2

x = 15

16)

x + 1 2/3 = -1,2 : 0,6

x + 1 2/3 = -2

x = -2 - 1 2/3

x = -3 2/3

17)

x + 9 3/11 = -68 : (-3,4)

x + 9 3/11 = 20

x = 20 - 9 3/11

x = 10 8/11