Answer:
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
