book Maths Puzzle Numerical Ability

Is there a specific formula to figuring out M2? For example: i have bedsheets and in my system is asking me to provide m2 How do I figure that out having only this number available

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x+5=-9

3=a-7

-2p=22

-c=-24

5m+3-4m=1

4d-6=6

32=-3a+5

2(5-n)=16

4e+2=3e-8

5x+12=7x-4

6R+7-(-2R)=6-3R+12

8(j-6)-4j=12

I would like the steps and a
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