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3x + 2y = 16
3x - 9y = -39
11y = 55
y = 5
x - 3y = -13
x - 3(5) = -13
x - 15 = -13
x = 2
masukkan x = 2 dan y = 5 kepersamaan 3x + ay = 31 untuk mencari a
3(2) + a(5) = 31
6 + 5a = 31
5a = 25
a = 5