exam Maths Puzzle Numerical Ability

If y(x-1)=z then x=
NEED SOME ASSISTANCE, THANKS

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exam Other Question

in parallelograms ABCD abovewhat is the value of x?
10x (25x-30) Multiply using the FOIL method: (2x + 1)(x - 2)
A) x - 1
B) 2x^2 - 3x - 2
C) 2x^2 + 2x - 1
D) 2x^2 + 5x + 2