misalkan buku = a, penggaris = b, pensil = c
(3a+2b+2c)+(2a+c)-(a+c+b)
=3a+2a-a+2b-b+2c+c-c
=4a+b+2c
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misalkan buku = a, penggaris = b, pensil = c
(3a+2b+2c)+(2a+c)-(a+c+b)
=3a+2a-a+2b-b+2c+c-c
=4a+b+2c