Rahul use addition property of equality in step 2.
Solution:
The image of the question is attached below.
Step 1:

combine like terms together.

To make the denominator same multiply and divide 2x by 5.
Step 2:

By addition property of equality, add
on both side of the equation.

Step 3:

Step 4:
Multiply by
on both side of the equation.

Hence Rahul use addition property of equality in step 2.
-10 and -2
Because -10-2= -12 and -10 x -2 = 20
Hope this helps :)
C, [1,109). Hope this helps you m8
B because it's not putting the blame on anyone. It is completely unbiased and objective.