z+j=24
z+6=2j
z=24-j
24-j+6=2j
3j=30
j=10
z=24-10
z=14
zosia ma 14 lat, a jasiu 10
x-wiek Zosi
y-wiek Jasia
x+y=24
x+6=2y
x-2y=-6 /*(-1)
-x+2y=6
3y=30 /:3
y=10
x+10=24
x=14
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z+j=24
z+6=2j
z=24-j
24-j+6=2j
z=24-j
3j=30
j=10
z=24-10
j=10
z=14
zosia ma 14 lat, a jasiu 10
x-wiek Zosi
y-wiek Jasia
x+y=24
x+6=2y
x+y=24
x-2y=-6 /*(-1)
x+y=24
-x+2y=6
3y=30 /:3
y=10
x+10=24
x=14