Answer:
115
Step-by-step explanation:
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Darius could have given 1 friend 18 muffins, 2 friends 9 muffins, 3 friends 6 muffins, 6 friends 3 muffins, 9 friends 2 muffins, or 18 friends 1 muffin
-6=-4(1)-2
-6=-4-2
-6=-6
The ordered pair still works.