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3x - 2y = -27 ( Ruas Kiri Kanan Kalikan 2) pers 2
6x + 21y = 21 (Hasil perkalian)
6x - 4y = -54 (Hasil perkalian)
25y = 75 (Hasil Eleminasi)
y= 3 (Hasil y)
3x - 2(3) = -27 (Substitusi nilai y ke persamaan diatas, saya ngambilnya yang ke 2)
3x - 18 = -27
3x = -27 +18
3x = -9
x = -3 (Hasil x)
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