book Maths Puzzle Numerical Ability

new to pre algebra

What are the correct steps to follow

7(j-5)+8=2(j+5)+5j

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book Other Question

Please explain how to sketch a graph of the following equation by finding 3 ordered pairs: x-y=4

Please show steps used so I am able to follow along. Thanks a million!
Write an equation of the circle whose center is at the origin and the point (3,-6) is on the circle.

I know the the formula to use is this:

(x-h)squared + (y-k)squared = r squared