Question 256306
{{{P=2L+2W=14}}}
{{{A=LW=12}}}
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{{{L+W=7}}}
{{{L=12/W}}}
{{{12/W+W=7}}}
{{{12+W^2=7W}}}
{{{W^2-7W+12=0}}}
{{{(W-3)(W-4)=0}}}
Two solutions:
{{{W-3=0}}}
{{{W=3}}}
{{{L=4}}}
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.
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{{{W-4=0}}}
{{{W=4}}}
{{{L=3}}}