Let, larger number be x and smaller number be y.
Condition 1: The summ of two numbers is 134.
It can be written as,

Condition 2: If three times the smaller number is subtracted from the larger number, the result is 18.
The equation is,

Solving equation 1 and 2,

Out the value of y=29 in equation (1),

Answer:
Larger number is x=105
Smaller number is y=29.