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bukutulis = 2x
10.500 = 3x + 2(2x)
10.500 = 3x + 4x
10.500 = 7x
1/7 x 10.500 = 1/7 x 7x
1500 = x
maka harga bolpen = x = 1500
maka harga bk tulis = 2x = 2 x 1500 = 3000