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The total cost of 6 pens and 3 folders. A folder costs $1.15 more than a pen.
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The total cost of 6 pens and 3 folders. A folder costs $1.15 more than a pen.

User Snnsnn
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f=p+1.15

c=6p+3f, using f from above we get:

c=6p+3(p+1.15)

c=6p+3p+3.45

c=9p+3.45
User Melab
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