The answer is below.
## newMult.asm
##
## Program to calculate 5 × x - 74
##
## Register Use:
## $8 x
## $9 result
.text
.globl main
main:
ori $8, $0, 12 # put x into $8
ori $9, $0, 5 # put 5 into $9
mult $9, $8 # lo <-- 5x
mflo $9 # $9 = 5x
addiu $9, $9,-74 # $9 = 5x - 74
## End of file