exam Maths Puzzle Numerical Ability

having a difficult time with finding the answer to a - 8 = 23? how do i solve a? and 13 + z = 6 how do I solve for z

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exam Other Question

Help solving this problem; y-2-8 sqrt(y-2) +15= 0 I need help solving this problem (x+3)(x-2)=14. I need to foil first and then I think I have to solve using the ABC method.