book Maths Puzzle Numerical Ability

what is the answer to this promblem
28-13+|z|
z=-5
please help me a.s.a.p
i dont understand it at all.

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book Other Question

-(x-3)-4(x-5)=-22 A variable z varies jointly with x and the square of y. If z = 6 when x = 4 and y = 3, write the equation of joint variation.