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{1/3x-2y=16/*3
{x+18y= -120
{x-6y=48/*(-1)
{x+18y= -120
{-x+6y= -48
---------------
18y+6y=-120-48
24y=-168/:24
y= -7
x+18y=-120
x+18*(-7)= -120
x-126= -120
x=-120+126
x=6
spr.
{1/6x+3y=-20
{1/3x-2y=16
{1/6*6+3*(-7)=-20
{1/3*6-2*(-7)=16
{1-21= -20
{2+14=16
{-20= -20
{16=16
{L=P
{L=P