exam Maths Puzzle Numerical Ability

if i have equ:

k = m + s + x + y + z
how do i solve for s?

s = ?

All you can do is get s by itself on one side of the equal sign. In this case, subtract the other terms.
s = k - m - x - y - z

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exam Other Question

If f(x)=x(x-1)(x-4)^2, use the interval notation to give all values of x where
f(x)>0.
Determine if the given numbers are solutions of the inequality.
7, -12, -14, -2

y-8>2y-2

Help me i do not no how to do these correctly