m+n=140 m+15n=980 (powinno wyjść m = 80 i n = 60)

m+n=140 m+15n=980 m=140-n 140-n+15n=980 14n=840 n=60 m=140-60 =80

m+n=140 /*(-1) m+15n=980 -m-n=-140 m+15n=980 ------------- 14n=840 n=60 m=140-60=80 m = 80 n = 60

m+n=140 m+15n=980 m=140-n 140-n+15n=980 m=140-n 14n=980-140 m=140-n n=60 m=80 n=60