Tolong ya.. buat nomor 3 butuh kepastian jawabannya

Tolong ya.. buat nomor 3 butuh kepastian jawabannya

$frac{2x - 2}{(x + 1)(x + 3)} - frac{4}{x + 3}$
$frac{2x - 2}{(x + 1)(x + 3)} - frac{4x + 4}{(x + 1)(x + 3)}$
$frac{2x - 2 - 4x - 4}{(x + 1)( x + 3)} = frac{ - 2x - 6}{(x + 1)(x + 3)} = frac{ - 2(x + 3)}{(x + 1)(x + 3)}$

Jadi disederhanakan (x+3) habis sisa – 2/(x+1) (d)