Question

logx=2-log5

Answer 1

log10 is 1
log 100 is log(10)^2 = 2

logx = log100 - log 5
log x = log(100/5)
log x = log 20
x = 20

Answer 2

that is a nice answer.
can also do
\[\log(x)+\log(5)=2\]
\[\log(5x)=2\]
\[5x=10^2=100\]
\[x=20\]

Answer 3

thank you