book Maths Puzzle Numerical Ability

I'm having problems grasping the concept and proceedure to solving algebraic equations, I'd appreciate it if you walk me step by step through an example equation, that I may grasp

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book Other Question
if points a,b,c lie on a coordinate line and points A and B have coordinates 6 and 12 respectively, then which of the possible coordinates for point satisfyes
d(A,C) < d (B,C)? choose a scale that you could use to graph each table....

x y

-5 10
2 -6
6 -15
13 -23

need help fast!!