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b) 4p+5q-p-4q = 3p -q
c) 7c²-2cd-3c(c-4d) = 7c²- 2cd-3c²+12cd
= 4c² + 10cd
d) 3y(4y-5)-4y(3-7y) = 12y²-15y-12y+28y²
= 40y²-27y