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b. 3(x-2)-2(x+3) =3x-6-2x-6 =x-12
c. soalnya kurang jelas
d. (6x-9)(4x+2y) =24x^2+12xy-36x-18y
=12x^2+6xy-18x-9
e. x^2-5x-24
= (x-8)(x+3)