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b) -y-y³+3y-5y²-7y³= 2y -5y² -8y³
c) 3j-4(j-3)-(5j+2)=3j-4j +12 -5j -2= -6j +10
d) -(x-7)-(x+3)-(5x+2)= -x+7-x-3-5x-2= -7x +2
b) -y-y³+3y-5y²-7y³= 2y -5y² -8y³
c) 3j-4(j-3)-(5j+2)=3j-4j +12 -5j -2= -6j +10
d) -(x-7)-(x+3)-(5x+2)= -x+7-x-3-5x-2= -7x +2