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x² + 3x + ax + 3a = x²+bx-12
x² + (a+3)x + 3a = x² + bx -12
maka
3a = -12
a = -12 / 3 = -4
dan
a+3 = b
-4 + 3 =b
b = -1
maka Jawaban yang benar adalah B. -1