consider the following LP
a. put the problem into standard form, using slack, excess, andartificial variables
b. solve the associated LP of phase I
c. is w'=0, proceed to phase 2 and solve the original LP. showall of the work.
max z=x1-x2+3x3
S.T. x1+x2<=20
x2+x3>=10
x1+x3=5
x1,x2>=0
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