math;SOS
posted by kristina .
solve the logarithmic equation.
log(5x+7)=1+log(x9)

log(5x+7)  log(x9) = 1 , condition: x > 9
log [ (5x+7)/(x9) ] = 1
(5x+7)/(x9 = 10^1
10x  90 = 5x + 7
5x =97
x = 97/5 = 19.4
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