Equations

1.  
A - x=11
B - x=-11
C - x=21
D - x=18

2.
A - 2
B - 3
C -   
D - -2

3.  
A - 8b+36=8b+36 identity or all numbers.
B - -8b-36=-8b-36 identity or all numbers.
C - -8b+36=-8b+36 identity or all numbers.
D - 8b-36=8b-36 identity or all numbers.

4.  
A - a=-0.5
B - a=-0.25
C - a=0.25
D - a=-0.2

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