exam Maths Puzzle Numerical Ability

find three consecutive odd integers such that the sum of the smallest and 4 times the largest is 61

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exam Other Question

Find the value of k so that the equation below has the solution set {-5}.

4(x+3)=x(3-k)

so far i have this but my main problem is what is the definition of a solution set?

4x+12=3x-kx minus 3x from each side. x+12/x= -kx/x then -12/x=k I need help.
Suppose that A^-1=Matrix[2 -1] find A
3 5