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3x + 4y = Rp 81.000
2x + 6y = Rp 104.000
5x + 5y = ?
6x + 8y = Rp 162.000
6x + 18y = Rp 312.000
-10y = - 150.000
y = 15.000
x = 7.000
5 (7.000) + 5 (15.000) = 35.000 + 75.000 = 110.000
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