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14x+3y=18[x1] 14x+3y=18
(dikurangi) = x =12(ini yang x)
5x+y=10 [x14] 70x+14y=140
14x+3y=18[x5] 70x+15y=90
(dikurangi) = - y =50
Y =-50(ini yg y)
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