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u2 = 2ˣ
r = u2/u1 = 2ˣ/2⁻⁴
r = 2ˣ⁺⁴
u8/u1 = 2⁵²/2⁻⁴
r⁷ = 2⁵⁶
(2ˣ⁺⁴)⁷ = (2)⁵⁶
7(x+4)= 56
x+ 4 = 8
x = 4
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