x-y supra 2=y+z supra 8=z supra 6 = k (egalezi cu k) ==>
x-y supra 2 = k ==> x-y = 2k
y+z supra 8 =k ==> y+z=8k
z supra 6 =k ==> z= 6k
x-y=2k
y+z=8k
z=6k
Inlocuiesti in a doua relatie:
y+6k =8k ==> y=2k
x-y=2k==> x-2k=2k==> x=4k
x+2z=48==> 4k+2*6k=48 ==> 4k+12k=48==>k=3
z=6*3=18
y=2*3=6
x=4*3=12