t+c=700 (-1) - t -c= -700
t+n=1200 t+n= 1200
- c + n = 500
c+n=1100 t+n=1200 t+c=700
- c + n = 500 t + 800= 1200 c+400=700
2n = 1600 t= 1200-800 c=700-400
n= 1600/2 t=400 c=300
n=800
e fui
