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3g + ½c= 8 |*-2
6g+9c=24
-6g-c=-16
+----------
8c=8 |:8
c=8
2g + 3c= 8
c=8
2g + 24= 8
c=8
2g=-16
c=8
g=-8
c=8
3m + 6d= 7
8m + 2d= 7 |* -3
3m + 6d= 7
-24m-6d= -21
+--------------
-21m=-14 |: -21
m=2/3
3m + 6d= 7
m=2/3
3*2/3 +6d= 7
m=2/3
6d=5 |:6
m=2/3
d=5/6
m=2/3