exam Maths Puzzle Numerical Ability

What should I do to make a linear equation change to its standard form?
what should I do if the slope and the y intercept is on the left side?? like this question : -2x +10=2y ? should I divide everything by -2??

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exam Other Question

The cost of a fish dinner to the owner of the Golden Wharf restaurant is $7.95, the fish dinner is sold for $11.95. Find the percent markup? I am suppose to add and express in the simplest form.

x-13/x^2-x-12 + 3x-3/x^2-x-12

Could you tell me if I have this correct I got: 4 / x - 4

Is this correct? Thank you for your help.