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x + xy + y + yx + x
= 2x + y + 2xy
4 - 2x + x2 + 2x + 4
= x2 + 8
10x - 2y
a) AC = a + b
b) CY = -b -1/2a
c) YZ = 1/2a + 1/3b
Answer is 60.
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