Jenny's Coffee Shop makes a blend that is a mixture of two types of coffee. Type A coffee costs Jenny $4.40 per pound, and type
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-1/9+-5/9=
When you are adding a negative number, the operation turns into subtraction:
-1/9-5/9=
Really, it's just subtraction. The simplest form is -2/3, which is equal to -0.66667.
I hope this helps :)