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Greenleafable
(6x3 + 18x2) - 3x2 =
6x3 + (18x2 - 3x2) =
6x3 + 15x2

The correct answer is D. 6x3 + 15x2. This is so because you can only subtract numbers which have the same power, such as 18x2 and 3x2 in this case. 6x3 stays the same. 
poopscooter352

Answer:

D

Step-by-step explanation: