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Jawaban Yang Tepat Adalah
(60 – x)(30 – x) = 1000
1800 – 90x + x^2 = 1000
x^2 – 90x + 1800 – 1000 = 0
x^2 – 90x + 800 = 0
(x – 80)(x - 10) = 0
x = 80
x = 10
1800 – 90x + x^2 = 1000
x^2 – 90x + 1800 – 1000 = 0
x^2 – 90x + 800 = 0
(x – 80)(x - 10) = 0
x = 80
x = 10
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