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Maximize:Z=10x1+12x2+8x3 "Subject to": x...

Maximize:`Z=10x_1+12x_2+8x_3`
`"Subject to": x_1+2x_2 le 30`
`5x_1 -7x_3 ge 12`
`x_1+x_2 +x_3 = 20`
`x_1,x_2 ge 0`

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