Count The Number Of Times X Appears In A Vector

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# create a vector of simulated data
numbers <- c(4,23,4,23,5,43,54,56,657,67,67,435,453,435,324,34,456,56,567,65,34,435)
# create an object that is our x
x <- 67
# the length of the subset of the variable numbers where numbers equals x
length(subset(numbers, numbers == x ))
[1] 2