{18+2a+2b=54 {6a+9b=126 ma wyjść: a=12 b=6

{18+2a+2b=54 {6a+9b=126 2a+2b=36 6a+9b=126 a=18-b 6*18-6b+9b=126 108+3b=126 3b=18 b=6 a=12

{18+2a+2b=54 {6a+9b=126 {2a=54-2b-18 {6a+9b=126 {a=27-b-9 {2*(27-b-9)+3b=42 {a=18-b {2*(18-b)+3b=42 {a=18-b {36-2b+3b=42 {a=18-b {b=6 {b=6 {a=18-b {b=6 {a=18-6 {b=6 {a=12