Exam Maths Puzzle Algebra

6(x+1) = 12(x-3)

then you get
6x+6=12x-36
My question at this point is: How do you know which side to start with. Not sure whether to start with +6 or -36 or 6x or 12x.

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Exam Other Question

A rectangle length is 5cm more than its width.if the perimeter is 40cm, find the length and width. what is the distance between points: (-1,1), (-1+3sqrt3,4)