Answer:
m = -29
Step-by-step explanation:
converting the words into mathematical expressions:
"sum of number m and 39" ---> m + 39
"sum of number m and 39 is 10" -----> m + 39 = 10
solving for m
m + 39 = 10 (subtract 39 from both sides)
m = 10 - 39
m = -29
