Question 1170229
{{{system(f-5=2(b-5),f+5=(1&1/3)(b+5))}}}

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{{{system(f-5=2b-10,f+5=(4/3)b+(4/3)5)}}}


{{{system(f-2b=-5,3f+15=4b+20)}}}


{{{system(-f+2b=5,3f-4b=5)}}}


2*E1 and then add corresp.membs.
{{{system(-2f+4b=10,3f-4b=5)}}}


{{{highlight(f=15)}}}-----------Fang


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{{{2b=f+5}}}
{{{b=(f+5)/2}}}
{{{b=(15+5)/2}}}
{{{highlight(b=10)}}}---------Buckbeak