5)

4*(x+14)-3*(x-12)=3*24

4x+56-3x+36=72

x+92=72

x=72-92

x= -20

6)

4*(7x-4)-9*(3x+3)=6*(8-x)

28x-16-27x-27=48-6x

x-43=48-6x

x+6x=48+43

7x=91

x=91:7

x=13

7)

2*(7x-3)-3*(4x+3)=18*(x-2)

14x-6-12x-9=18x-36

2x-15=18x-36

18x-2x=36-15

16x=21

x=21:16

x= 1 5/16