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b.) 3q + q + 7q + 2q + 6q + q = 20q
c.) r + 2r + 5r + 8r + r = 17r
d.) x² + 2x² + 7x² + 7x² + 2x² + 3x² + x² = 23x²
e.) 2p + q + p + 2q + 3p + q = 6p + 4q
f.) 3q + 5r + q + 2r + 7q + 4r = 11q + 11r
g.) x² + 3y + 2x² + 5y + 7x² + 2y = 10x² + 10y
h.) 2xy + 5yz + 4xy + 6yz + xy + 8yz = 7xy + 19yz