Question

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Answer 1

I believe the answer is 18.

Answer 2

Answer:

1) 18. 2) -5. 3) He did not subtract 12 from 36. 4) zero. 5) 5.

Step-by-step explanation:

Question 1:

x-7 = 11

x = 11+7 = 18.

Question 2:

11+z = 6

z = 6-11 = -5.

Question 3:

we have 12 + x = 36, we need to subtract 12 from 36 to find x.

Question 4:

x + 5 = x

5 = x-x

5 = 0.

this has no sense, then there are not solution.

Question 5:

6x = 30

x = 30/6

x = 5.