exam Maths Puzzle Numerical Ability

Find a value for k so that 9mto the power of 2 - kn to the power 2 will have the factors 3m + 7n and 3m + 7n.

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exam Other Question
2X-3/3=3x+2/5 How do you know when an equation has an infinitely number of solutions or when an equation has no solution?