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a)
P=4x + x + x + 5x + 7
P=11x + 7
b)
P=x + x + 2x + 2x + 3x + 7
P=9x + 7
c)
P=3x + 3x + 4xy + 4xy
P=6x+8xy
d)
P=3x + 2y + 4xy