exam Maths Puzzle Numerical Ability

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)

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Need help simplyfing this...

Simplify: (-4 + x2 + 2x3) - (-6 - x + 3x3) - (-6y3 + y2) can you help me
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becky wants to buy a computer that costs $1590. if becky earns $6.25 per hour, what is the minimum number of whole hours that she must work to earn enough money to buy the computer?