Question

2 (2x+5)-(4x-9)=3 (3-4x)

Answer 1

2 . (2x + 5) - (4x - 9) = 3 . (3 - 4x)
Aplicando a distributiva:
4x + 10 - 4x + 9 = 9 - 12x
4x - 4x + 12x = 9 - 10 - 9
12x = -10
x = $\frac{-10}{12}$ ou simplificando $\frac{-5}{6}$

Espero ter ajudado :) 

Answer 2

10+9=9-12x=12x=10= x=_10/12=-5/6