1ere equation : -2(2y-4)=6y-(-3+y) 2eme equation : 4y-2+(5y-1)=-3(7-y)

-2(2y-4)=6y-(-3+y)

-4y+8=6y+3-y

8-3=5y+4y

5=9y

5/9=y

4y-2+(5y-1)=-3(7-y)

4y-10y+2=-21+3y

-6y+2=3y-21

23=9y

23/9=y