Răspuns :
gaini=g
rate=r
g=4r
g-4=3(r+2)
g-4=3r+6 /+4
g=3r+10
g=4r /
g=3r+10/=> r=10
g=40
rate=r
g=4r
g-4=3(r+2)
g-4=3r+6 /+4
g=3r+10
g=4r /
g=3r+10/=> r=10
g=40