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penghapus = b
a = 4b
3a+2b = 10.500
3(4b)+2b = 10.500
12b+2b = 10.500
14b = 10.500
b = 750
a = 4b
a = 4(750)
a = 3000
a+4b = 3000 + 3000
= 6000