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(3x+z)•(w+2y)
2. 2y•(w-2x)+z•(w-2x)
(w-2x)•(2y+z)
3. 3x•(3+2y)+2(2y+3)
(3+2y)•(3x+2)
4. 3w•(y+1)-4x•(y+1)
(y+1)•(3w-4x)
5. ((2^2+ 10xz) - 3xy) - 15zy
2^2+ 10xz - 3xy - 15zy