1 3,24+x/3,9=1 3/5
(3,24+x)/3,9 = 1,6
3,24+x = 3,9×1,6
3,24+x = 6,24
x=6,24-3,24 = 3
2 (8,48-x)/3,2 = 2 3/20
8,48-x = 3,2×2,15
8,48-x=6,88
x = 8,48-6,88=1,6
34 9,625-(15/x+4)=7 1/8
(-15/x+4) = 9,625 - 7,125
(-15/x+4) = 2,5
x+4 = (-15/2,5)
x+4 = -6
x = -10