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caranya (x1+x2/2, y1+y2/2) itu titik tengah
jadi (3+a/2, 8-2/2) = (5,3)
3+a/2=5 -> 3+a = 10, a=7
m = ( 8 - 3 ) : ( 3 - 5 )
m = 5 : -2
m = -5/2
m = ( y₂ - y₁ ) : ( x₂ - x₁ )
-5/2 = ( -2 - 8 ) : ( a - 3 )
-5/2 = -10 : ( a - 3 )
-20 = -5 ( a - 3 )
-20 = -5a + 15
a = ( 15 + 20 ) : 5
a = 35 : 5
a = 7