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ᵃlog 2⁷ - ᵃlog 2⁶ + ᵃlog 2⁻³ = 2 ᵃlog a
ᵃlog (2⁷ × 2⁻³ / 2⁶) = ᵃlog a²
2⁷ × 2⁻³ / 2⁶ = a²
2⁷⁻³⁻⁶ = a²
2⁻² = a²
¼ = a²
a = ½ atau a = -½
tetapi a harus > 0
Jadi nilai a yang memenuhi a = ½ ← jwb