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altavistard

The x-coordinate of the midpoint is the mean of the two given points:

midpoint = (-2 + 12) / 2, or 10/2, or 5. Notice that this 5 is 7 units to the right of -2 and 7 units to the left of 12, confirming that 5 is indeed the midpoint.
Draw a number line with -2 and 12 at the ends. Then, cross off 1 number on each side. Keep going until you end up with one number. The answer is 5.