Verified answer

3) 23,8y-24,3y=2+80

-0,5y=82

-y/2=82

y= -164

4) 95y-98y=-1+4,9

-3y= 3,9

y= 3,9:(-3)

y= -1,3

5) 121z/15-9z=-13+27

(121z-135z)/15= 14

-14z/15=14

-z/15=1

z= -15

6) 41t/45-11t/9= -7/9-2/9

(41t-55t)/45= -9/9

-14t/45= -1

t= 45/14= 3 3/14