Jika 1/4(x+10) = 3/8(x-2) + 5/8 maka nilai (x-9) adalah.......

¼ ( x + 10 ) = 3/8 ( x - 2 ) + 5/8

¼ x + 10/4 = ⅜ x - 6/8 + 5/8

¼x - ⅜x = - 1/8 - 10/4

2/8x - 3/8x = - 1/8 - 20/8

- 1/8 x = - 21/8

x = - 21/8 ÷ - 1/8

x = - 21/8 × - 8/1

x = 21