a) 21 -15 +36 z
c)4 -8 -20 -48x
d) + -4 +5x-3
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I've made some progress...not really, actually
for a) i got 3 z (7x -5 +12 y)......I'm not sure if this is the last step or if there's more...
The first one has a common factor . . . and that's all.
The others require knowledge of the Factor Theorem. . . . You got it! . . .Good!
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