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4x+2y=42.000 I*1I 4x+2y=42.000
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2x =9000
x=4.500
jadi harga 2 mangga =2*4.500= 9000
4x + 2y = Rp.42.000 I× 1I 4x + 2y = 42.000
-------------------------- -
2x = 9.000
x = 9.000 ÷ 2
x = 4.500
2x = ....
2 × 4.500 = Rp.9.000