book Maths Puzzle Numerical Ability

using -1 as a factor (divide)

-a+3
______ =
2a-6

thanx

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book Other Question

What is the slope of the line that passes through (-8,7) and (5,-2)
I thought that the slope was 3, but I just redid the problem and got a completely different answer. could you p The absolute value of 5 is ?