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b. 2x+6= 2(x+3)
c. 4x^4y-6xy^3= 2xy(2x^3-3y^2)
d. 8pq+24pqr=8pq(1+3r)
e. 1-x^2=(x-1)(x+1)
f. 8a^2-2b^2=2(4a^2-b^2)