nomer 7 8 9 ada yg bisa nggak?

no 7
8/8+x = 6/9
6(8+x) = 8×9
48+6x = 72
6x = 72-48
6x = 24
x = 4

no 8
10/10-x = 8/6
8(10-x) = 10×6
80-8x = 60
-8x = 60-80
x = 20/-8
x = 2,5
CE= 10-2,5
= 7,5