Answer:
X= 53
Random comment:
Hopefully i've helped you good luck.
If the "problem of 3 and a number " is multiplying:
If it's about adding:
Scenario A: If it's 3 and z, then that means it's 3, and we're adding 4, so it's (make sure to put () around the 3!)
Scenario B: If 3 and z is also 3+, then the equation is (also use () on this too!)