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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 = 104/9
x = 102/3
x = 33 and 1/3
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