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penghapus = b
4b = a
3a+2b = 42.000 | ×1
-a + 4b = 0. | ×3
-----------------------
3a + 2b = 42.000
-3a + 12 b = 0
----------------------- +
14 b. = 42.000
b = 42.000/ 14
b = 3.000
a = 4b
a = 4(3.000)
a = 12.000
karena a = 4b maka 4 penghapus harganya rp.12.000
maka harga penggaris rp.12.000
dan harga 4 penghapus rp. 12.000
#jadiin yang brainliest ya mhn kak