ZP – 15.0 + 50 = 0
2.
3.12 + 2.1 – 5= 0
3.
4523-9.02 – 52 +1=0

72 is the answer to this problem

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: