Question 317124
{{{highlight( 2*x1-x2+x3=1)}}}
{{{2t-1-t+2-t=2t-2t+2-1=1}}}
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{{{highlight(2*x1+3*x2+5*x3=13)}}}
{{{2t+3+3t+10-5t=5t-5t+3+10=13}}}