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