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b) (3a-2) - (a+4) + (a-3) = 3a-2-a-4+a-3=3a-9=3(a-3)
c) 4(2y-7y²) - 3(y²-3y) = 8y-28y²-3y²+9y=17y-25y²
d) -5(2b+3z) + 2(2b-4z) = -10b-15z+4b-8z=-6b-23z