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· PDF file2y-18 18 12 6 9 —Y ) Z x 10 O ... 3x=9+2y 4X=3X-y+7 2x+y = 31 —y —4 1) (x, x 11 ... o.3x-o.2y=- 0.081+0.01y=2 C X, 40) 32 . o
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