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log x⁵/10 - (log x)² = 5
log² x - log x⁵/10 + 5 = 0
log² x - 5.log x + log 10 + 5 = 0
log² x - 5.log x + 1 + 5 = 0
log² x - 5.log x + 6 = 0
(log x - 3)(log x - 2) = 0
log x = 3 atau log x = 2
x = 10³ atau x = 10²
x₁ + x₂ = 10³ + 10²
= 1000 + 100
= 1100..............opsi E