A pen costs twice as much as a pencil. The total cost of 1 pen and 1 pencil is $2.10. If p represents the cost of 1 pencil, whic
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The differnce of 2 perfect cubes
remember
a³-b³=(a-b)(a²+ab+b²)
so
remember
a³-b³=(a-b)(a²+ab+b²)
so