Take the first 2 and take out -7x2. bringing it to (-7x2)(x-3)+(3x-9)
then take out 3 on the right side.
-7x^2 (x-3)+3 (x-3)
factors to (3-7x2)(x-3)
6*6=36.....................
As long as the mass of the chip is evenly distributed on each side, whatever times you flip the chip,
The probability will always be 50%
240
/ \
5 48
/ \
6 8
/ \ / \
3 2 4 2