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x > 1 syaratnya
7log (x-1) = 2
7log (x-1) = 2 × 7log 7
7log (x-1) = 7log 7^2
7log diruas kanan dan kiri di hapus
(x-1) = 7^2
x - 1 = 49
x = 49 + 1
x = 50 memenuhi syarat
jawabannya C