1.49-3x=34

-3x=34-1.49

-3x=32,51

x=32,51/-3

х=-10,8366666667

2.9y-89=55

2.9y=55+89

2.9y=144

y=144/2.9

у=49,6551724138

3.74-8z=2

-8z=2-3.74

-8z=-1.74

z=-1.74/-8

z=0.2175