Question 966951
THe midpoint is the average of x and y values.
{{{6=(-3+x[B])/2}}}
{{{-3+x[B]=12}}}
{{{x[B]=15}}}
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{{{-2=(-1+y[B])/2}}}
{{{-1+y[B]=-4}}}
{{{y[B]=-3}}}
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(15,-3)
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*[illustration Des8.JPG].