ответ:

1) -6x=4

x= -2/3

2) 3/4у=1целая1/8

y=1целая1/8:3/4

y=9/8:3/4=3/2

y=1целая 1/2

y=1.5

3) 2z-3=5+3z

2z-3z=5+3

-z=8

z=-8

4) 2*(1.2p-0.5)-(-3+0.8p)=1.6

2.4p-1+3-0.8p=1.6

1.6p=1.6+1-3

1.6p=-0.4

p=-0.4/1.6

p=-1/4

p=-0.25