exam Maths Puzzle Numerical Ability

Need help simplyfing this...

Simplify: (-4 + x2 + 2x3) - (-6 - x + 3x3) - (-6y3 + y2)

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exam Other Question

Explain when to use a permutation and when to use a combination when choosing r objects from n objects I have no idea how to do this. Please help.

Solve the following equations for the unknown.

x/3 - 7/8 = 2/5(x + 15/4)