= (7⁵ × 7ⁿ)⁴ = (7¹⁶/7ⁿ)³
= (7²⁰ × 7⁴ⁿ) = (7¹⁶ × 7-ⁿ)³
= 7²⁰⁺ ⁴ⁿ = 7⁴⁸ ⁻ ³ⁿ
= 20 + 4n = 48 - 3n
= 20 - 48 = -3n - 4n
= -28 = -7n
= -28/-7 = n
= 4 = n
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