Photos 12.4 8.9

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12.4 8.9. (-12,4+8,9)*13/7=. (-12, 4+8, 9) *1 3/2. (-8,4+1,9):1,3. (-12,4+8,9)*1 3/7.
(-12,4+8,9)*13/7=. (-12, 4+8, 9) *1 3/2. (-8,4+1,9):1,3. (-12,4+8,9)*1 3/7.

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