what is x2+6x+2=-4 ?

i need help explain show steps please!!!
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I need help to         maximize z=x1+1.25x2+1.5x3        using simplex method

subject to: x1+x2+x3equal or less 11

x2 equal or less 4

x1+4x3 equal or less than 13

x1,x2,x3 great than 0
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