book Maths Puzzle Numerical Ability

critical thinking. find a value for a such that (x)=x+a has exactly one solution.

i hope you can help me out please.

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book Other Question

Solve for k: 5{(3-2k)+k}-6 = 2k-4(-3k-2)-12. Express your answer as a simplified fraction. PLEASE HELP! a jar contains white marbles & blue marbles only. the number of white marbles is 3 more than twice the number of blue marbles. the ratio of the number of blue marbles to the total