On the number line, a point was moved from -7 to -3. which of the following problems describes this move? a: -7 - 4 = -3 b: -7 + 3 = -4 c: -7 - 3 = -10 d: -7 + 4 = -3

1)     -7 + x =-3
- 7+7 + x =-3 +7
x=4
Answer is D. -7 + 4 = -3

2) You can also think following way,
- 3 is more than -7.
It means, that positive number was added to -7.
When you add 4 to -7, 
- 7 +4=-3.

Answer is D. -7 + 4 = -3

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