1)
a+b=748533
a-b=230669=>a=230669+b
a;b=?
230669+b+b=748533
2b=748533-230669
2b=517864
b=517864:2
b=258932
a+258932=748533
a=748533-258932
a=489601
2)
t+f=53 ani
f=t-31 ani
t+t-31ani=53 ani
2t=53 ani+31 ani
2t=84 ani
t=84 ani:2
t=42 ani (tata)
f=42 ani-31 ani
f= 11 ani3
3)
e=elefant
r=rinocer
e+r=7349 kg
e=r+2363 kg
r+2363 kg+r=7349 kg
2r=7349 kg-2363 kg
2r=4986 kg
r=4986 kg:2
r=2493 kg
e=2493 kg+2363 kg
e=4856 kg
