Escribir cada expresión como una razón: 2 es a 15
0,75 es a 2
2/3 es a 5
3/5 es a 2/3

x equals 1

step-by-step explanation:

f(4)=f(×)

x=1

take the logarithm of both sides (the base of the log doesn't matter):

apply the exponent property - this says that :

distribute the log terms on both sides:

group like terms together:

divide through both sides by the coefficient on :

you can do some additional rewriting here using the properties of the logarithm to simplify things if you like:

inverse operation of addition