1)x+2(17/20)=3(1/2)
x+(57/20)=(7/2)
x=(7/2)-(57/20)
x=(140/40)-(114/40)
x=26/40
x=13/20
x=0,65
2)-5(1/3)*x=56/69
-(16/3)*x=56/69
x=-((56*3)/(69*16))
x=-(56/(23*16))
x=-(14/(23*4))
x=-(14/92)
x=-(7/46)
3)x / -(1(1/2)) = 13/20
-2x/3=13/20
-2x=(13*3)/20
x=-39/40
4)(5/8)y - (3/4) = 2y - 2(2/5)
(5/8)y-2y = - (12/5) + (3/4)
(5/8)y-(16/8)y = - (48/20) + (15/20)
-(11/8)y = - (33/20)
y = (33*8)/(20*11)
y = (3*4)/10
y = 12/10
y = 1,2