Question

2(3+3x)-3(1-3x)-7(3-3x)=0

Answer 1

2 (3 + 3x) - 3 (1 - 3x) - 7 (3 - 3x) = 0

6 + 6x - 3 + 9x - 21 + 21x = 0

6x + 9x + 21x + 6 - 3 - 21 = 0

36x - 18 = 0

36x = 18--despejamos x

x = 18/36--simplificamos

x = 1/2

Solución :; 

x = 1/2

Answer 2

6+6x-3+9x-21+21x=0
6x+9x+21x=0-6+3+21
36x=18
x=18/36
x=1/2