exam Maths Puzzle Numerical Ability

x - 11 = 5
I know for a lot of people this is simple, but I have been out of school for 20+ years and never took any algebra before. This is all Greek to me. Please help!

Thank you!

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exam Other Question

1) Give the three equtions that would find the temperatures at x1, x2, x3 shown in the figure below, if the temperature of each interior point is the average of its four neighborin It would be great if someone could help me with this and maybe give a small summary because I can't really get it quiet down how to do this:

Graph each equation to find the solu