jika hasil dari 12/√7 + 3 = a(3-√7) nilai a?

12/(√7 + 3) = a(3 -√7)
12(√7 -3)/(7-9) = a(3 - √7)
12(√7 -3)/-2 = a(3 - √7)
-6(√7 -3) = a(3 -√7)
6(3-√7) = a(3-√7)
a = 6

mohon maaf jika kurang benar