What is the answer to 3*+9=42

x = 11

Step-by-step explanation:

from question 3x + 9 = 42

collect the like terms

3x = 42-9

3x = 33

divide both sides by 3

3x/3 = 33/3

x = 11

to check if your answer is correct, put 11 where you see x in the question.

3x + 9 = 42

3 (11) + 9 = 42

33+9 = 42

42 = 42 ... proved