log 15-log 5=log x i need to solve for x?

sure can.

log 15 - log 5

that can be simplified as

log 15/5

which is 3

so log 3 = log x

and x has to be 3.

log(15) - log(5) = log(x)
log(15/5) = log(x)
log(x) = log(3)
x = 3

log [ 15 / 5 ] = log x

log 3 = log x

x = 3