<em>с/d=1/10</em>
<em>d/c=10/1</em>
<em>Ответ 10</em>
1/x-6+(4/x+6)=3/x-4
1/x-6+4/x+6-3/x+4=0
2/x=-4
x=-1/2 или x=-0.5
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