plisssssssssss batu saya

Persamaan Linier

8.
2/(x-9) = 9/(x+12)
9(x-9)= 2(x +12)
9x - 81 = 2x + 24
9x- 2x = 24 + 81
7x = 105
x = 15

9.
(2x-1)/5 = (x+1)/2
5(x+1) = 2(2x-1)
5x+ 5 = 4x - 2
5x - 4x = -2 - 5
-x = - 7
x = 7

10.
2/(x+1) =1/6 -  1/(3x+3).
2/(x+1) + 1/(3x +3) = 6 ......kalikan (x+1)(3x+3)
2(3x+3) + 1(x+1) = 6(x+1)(3x+3)
6x + 6 + x + 1  = 6(3x² + 6x + 9)
7x + 7 = 18x² + 36x + 54
18x² + 36x - 7x + 54 - 7 = 0
18x² + 29x  + 47 = 0