At the football game, 3 hamburgers and 6 soft drinks cost $27, and 4 hamburgers and 2 soft drinks cost $18. Which two
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The subtraction theorem states that for all real numbers, 
and 
, 
.
(To subtract, we can add the inverse.)
Thus, we can have the these two equivalent expressions.
(To subtract, we can add the inverse.)
Thus, we can have the these two equivalent expressions.