book Maths Puzzle Numerical Ability

please help solve this
3x=wyz

solve for x, w, and y
please explain so i can try to do others without help, thank you very much

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book Other Question
expand the brackets in the following

x(3-y)
(x+1)(x+2)
az(z2+bz)
(x+y)(x-y) use the discriminant to find what type of solutions the equation has (two rational, two irrational, one rational, or two nonreal complex. Do not solve

4x^2 + 9 = 12x