Answer :

Equation: 3x+9=42

3x=42-9=33

Answer: x=33/3=11


Hope this helps!!
ZavierL
_Award brainliest if helped!
Let Unknown number be X , 

42 = 9 + 3(X)
42-9 = 3X
33 = 3X
X = 11 
The number is 11 

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