Question 279134
{{{X=52-10Y-Z}}}
{{{260-49Y=15+Z}}}
{{{245-49Y=Z}}}
{{{(52-10Y-Z)+2Y-3(245-49Y)=12}}}
{{{52-10Y-(245-49Y)+2Y-735-147Y=12}}}
{{{-940-204Y=0}}}  
{{{-940=204y}}}  
{{{-940/204=y}}}
{{{-235/51=y}}}