7y-4/2和y+2/5-2互为相反数,y为多少

7y-4/2和y+2/5-2互为相反数,y为多少
7y-4/2和y+2/5-2互为相反数,y为多少

7y-4/2和y+2/5-2互为相反数,y为多少
(7y-4)/2=-[(y+2)/5-2]
3.5y-2=2-(0.2y+0.4)=1.6-0.2y
3.7y=3.6
y=36/37

8y-4.4=0
y=0.55

8Y=1.5
Y=3/16

7y-4/2=-(y+2/5-2)
8y=3.6
y=0.45