exam Maths Puzzle Numerical Ability

8.) a^2 - b^2-c^2-2bc / a^2 + b^2-c^2-2ab

please explain this to me...
i tried factoring by grouping and ended up with a completely wrong answer on my worksheet ):

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A line passes through the points (7,-3) and (1,3),find the standard form of the line(ax+by=c) Hi, I need to insert parentheses to make the following equation true.
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Thank you.