1. 28yz-217°:4 +35y2z2
(a) 7y2z(4z - 3 yz? + 5z)
(b) 7yz(4 - 3y2z3 + 5 yz)
(C) 7yz(4 yz - 3y2z2 + 5 yz?)
(d) 7y2z2 (4-32+ 5)
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