Tolong jawaban no. 10, sertakan cara. Terima kasih

Bab Aljabar
Matematika SMP Kelas VIII

3 CF = 5 FB
CF : FB = 5 : 3

EF = 41 1/4
(FB . CD) + (CF . AB) = 41,25 . (CF + FB)
3 (4x - 6) + 5 (5x + 3) = 41,25 . (5 + 3)
12x - 18 + 25x + 15 = 41,25 . 8
37x = 330 + 3
x = 333/37
x = 9

jawabannya C