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Minimize:Z=20x1+10x2 "Subject to": x1+2x...

Minimize:`Z=20x_1+10x_2`
`"Subject to": x_1+2x_2 le 40`
`3x_1 -x_2 ge 30`
`4x_1+3x_2 ge= 60`
`x_1,x_2 ge 0`

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