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How do I find the midpoint

How do I find the midpoint-example-1

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g is midopint so FG=GF so 11x-7=3x+9

11x-7=3x+9
solve
minus 3x both sides
8x-7=9
add 7 to both sides
8x=16
divide both sides by 8
x=2

FG=11x-7
FG=11(2)-7
FG=22-7
FG=15 units
User Blueicefield
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