Answer: 181

Small Hint:

Let $S=x_1+x_2+x_3+x_4+x_5$

Big Hint:

Each equation has the form $S+x_i=$ a constant

Solution:

Put $S=x_1+x_2+x_3+x_4+x_5.$ The five equations say that $S+x_i$ equals $6,$ $12,$ $24,$ $48,$ $96,$ respectively. Adding them gives $$\begin{aligned} 6S&=6+12+24+48+96\\ &=186, \end{aligned}$$ so $S=31.$ Hence $x_4=48-31=17$ and $x_5=96-31=65.$ The requested value is $3(17)+2(65)=181.$