math,help

this is from another section one of the problems can someone help me.

dierections: use the simplex method to solve each linear programming problem.

maximize z = 12x1 +15x2 +5x3
subject to: 2x1+2x2+x3 <= 8
x1+4x2+3x3<=12
with x>=0,x2>=0,x3>0

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