tolong jawab pakai caranya yang B,E,F

a. salah

b.
[tex]x - (x - 3) = 5x \\ { - x}^{2} + 3x = 5x \\ { - x}^{2} = 5x - 3x \\ { - x}^{2} = 2x \: (salah)[/tex]
e.
[tex] -x = - 6 (masing - masing \: dibagi \: - 1) \\ \frac{ - x}{ - 1} = \frac{ - 6}{ - 1} \\ x = 6 \: (benar) [/tex]
f.
[tex]2(3x + 4) = 6x + 12 \\ 6x + 8 = 6x + 12 \\ 6x - 6x = 12 - 8 \\ x = 4 \: (salah)[/tex]
I'm sorry if i was wrong