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Matematika
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1 Jawaban
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1. Jawaban ariyat
x/7 = (x+4)/(7+5)
x/7 = (x+4)/12
12(x) = 7(x+4)
12x = 7x + 28
12x - 7x = 28
5x = 28
x = 28/5
x = 5,6