exam Maths Puzzle Numerical Ability

2x+3y=21
-3x-6y=-24

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exam Other Question

I am having problems with this one

x^2=-5x-5 Can you breakdown or simplify the follwing for my understanding:

1. 6x-5+3x-29

2. 5x+3+6x-11=8x+25

3. 4(-x-2)+5=-2(2x+7)