Apa jawabannya kalau soalnya (3-17x +35z) + (4x+23y-9)

(3 – 17x + 35z) + (4x + 23y – 9)
= 3 – 9 – 17x + 4x + 35z + 23y
= – 6 – 13x + 35z + 23y