Răspuns:
2a+5b+4c+1/5a+7b+8c=2/3
a+b+c=?
=>2/3(5a+7b+8c)=2a+5b+4c+1
<=>4a/3+4c/3=b/3+1
<=>4a+4c-b=3=>a+c=b+3/4
=>a+b+c=b/4+b+3/4<=>a+b+c=2b+3/4
Explicație pas cu pas:
2a+5b+4c+1/5a+7b+8c=2/3
a+b+c=?
=>2/3(5a+7b+8c)=2a+5b+4c+1
<=>4a/3+4c/3=b/3+1
<=>4a+4c-b=3=>a+c=b+3/4
=>a+b+c=b/4+b+3/4<=>a+b+c=2b+3/4
