exam Maths Puzzle Numerical Ability

Find the value of m such that (8,-2) is the midpoint between (m,3) and (10-7)

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exam Other Question

1)Given the binary operation * defined over the set of real numbers R by a*b=a+b+ab. What are the invertible elements of R with respect to *.
Find the exact solution to 6x^2 + 1 = -8x by suing the Quadratic formula.

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