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36 x 4 + 3 x 7 - 12 x 5 - 9 x 6
= 144 + 21 - 60 - 54
Luego se realizan las sumas y restas:
= 144 + 21 - 60 - 54
= 165 - 60 - 54
= 105 - 54
= 51