Question 859169
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Hi,
Let x and y represent the coordinates of R    
Midpoint Pt(x,y):  ( {{{(x[1] + x[2])/2}}}, {{{(y[1] + y[2])/2  )}}})
S are (9, 5).   Midpoint (8,7)
(x+9)/2 = 8
    x = 7
(y + 5)/2 = 7
     y = 9
(7, 9) coordinates of R