book Maths Puzzle Numerical Ability

What is the solution to this problem and it's steps?
25 - [2 + 5y - 3(y +2)] = -3(2y -5) - [5(y - 1) 1 3y + 3]

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book Other Question

I need to know how to graph
2x-7y=3
5x-4y=-6

And I also need to know how many solutions it has.
Could you please help me? thanks! How long would it take to travel 100 km in a car at about 3 am on a wednesday. this is travelling from hillingdon to eastbourne.