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pulpen =b
6a+ 7b = 11750 X2
4a + 3b = 5750 X3
12a + 14b=23500
12a + 9b = 17250
---------------------------- -
5b= 6250
b= 1250------> pulpen
4a + 3b =5750
4a + 3750 = 5750
4a = 2000
a=500----------> pensil