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420(80) = 420x + (420 - 70)(80 + 12 - x)
33600 = 420x + 350(92 - x)
33600 = 420x - 350x +3220033600 = 70x + 32200
33600 - 32200 = 1400 = 70x
1400/70 = x
20 = x
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