E is the midpoint of line BC
B is (-2x, -4y), C is (8x, -2y)
Δx = +10x
Δy = +2y
divide both by 2
x = +5x
y = + 1y
add to B
-2x + 5x = 3x
-4y + 1y = -3y
3x, -3y
I assume you got it wrong because you didnt include the x and y
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