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Answer: -4
Why?
When we subtract with negative numbers, it has it's own chart. (x - y = z | -x - y = -z and -x - (-y) = z) If we follow the chart, we are going to end up with a negative number. To solve, just subtract, and carry the negative sign. (7 - 3 = 4. Carry the -. 4 ==> -4) So, the answer is -4.
