Max z $=12$X$1-3$X$2+18$X$3$

X$1+2$X$2+5$X$3=12$

$2$X$1+$X$2+8$X$3>=15$

X$1,$X$2,$X$3>=0$

Solve this with using big M method and also solve this with using two phase method $($big M methods alternative$)$ Need to solution tables one by one