log(1000) = 3
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If the log of x equals -3 then x = 10-3 or 0.001or 1/1000.
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1
You calculate a log, you do not solve a log!
log(9x) + log(x) = 4log(10)log(9) + log(x) + log(x) = 4log(10)2log(x) = 4log(10) - log(9)log(x2) = log(104) - log(9)log(x2) = log(104/9)x2 = 104/9x = 102/3x = 33 and 1/3