Répondre :
1er exercice :
3x - 1/2 = -3/4-5x
3x+5x = -3/4 + 1/2
8x = -1/4
x=8*4/-2
x=-1/32
-4/5+y =3/10-1/2y
y+1/2y = 4/5+3/10
3/2y=11/10
y=11*2/10*3
y=11/15
1er exercice :
3x - 1/2 = -3/4-5x
3x+5x = -3/4 + 1/2
8x = -1/4
x=8*4/-2
x=-1/32
-4/5+y =3/10-1/2y
y+1/2y = 4/5+3/10
3/2y=11/10
y=11*2/10*3
y=11/15