exam Maths Puzzle Numerical Ability

what is -6z-14+26+2z=-12=8? i need the steps shown! thank you very much!

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exam Other Question

Graph the functions.
IF f(x)=4x-3
find F(-1)

And IF F(x)=5x-1 graph and find F(a-2) the square of a number decreased by 6 is 10. find the numbers.