Question

три(два икс-девять)=5(х-4)

Answer 1

3 * (2x - 9) = 5 * (x - 4) 
6x - 27 = 5x - 20
6x - 5x = 27 - 20
x = 7

Ответ: 7.

Answer 2

3(2x-9)=5(x-4)
6x-27=5x-20
6x-5x=27-20
1x=7
x=7:1
x=7