It equals 0.4971
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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
You calculate a log, you do not solve a log!
There are many. Here are a few: E = m c2 m v r = n h / (2 pi) A = L W P V = n K T V = 4/3 pi R3 F1 = 72.1 sqrt[ d1d2/(F·D) ] h = d1d2/(1.5 K) GA = 20 log (F·D) + 7.5 C2 = A2 + B2 x2 + y2 = R2 LFS = 20 log (F·D) + 96.58 E = I R