bantuin kak tlong jgn ngawur karna sy mmberi poin. mksh

9/(9+x) = 6/(6+4)
9/(9+x) = 6/10
6(9+x) = 9×10
54 + 6x = 90
6x = 90 - 54
x = 36/6 = 6
9/y = (9+6)/25
9/y = 15/25
15y = 25×9
y = 25×9/15
y = 15