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b. 3q+q+7q+2q+6q+q = 20q
c. r+2r+8r+r = 12r
d. 23x²
= 2p + p + 3p + 5p + p
= 12p
nomer b
= 3q + q + 7q + 2q + 6q + q
= 20q
nomer c
= r + 2r + 5r + 8r + r
= 17r
nomer d
= x² + 2x² + 7x² + 7x² + 2x² + 3x² + x²
= 23x²