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I would always approach this type of question methodically in the same way each time to minimise panic in exams. 1. Collect the like terms together (10x = 10) 2.Divide to find the solution (x=10)

I tend to use rhymes to remember difficult maths formulas - it makes life so much easier! For example, "I never knew how much I cared that the area of a circle is πr²". 

The key thing to remember when approaching extract questions is to stay calm! It is easy to panic when faced with a question like this - as long as you know your text well and have practised sufficient...