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Kalo pilihan persamaan 1, salah. Kenapa? -1 x -7 seharusnya 7, tapi di situ, -7.
Perhatikan belakang belakangnya aja. Persamaan 4, -4 x -4 = 16, tapi di soal -16, lhoo salah kan? Sama denganyabg dua dan tiga.
Maaf lama :)