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It is known that the distance from a straight line L to two parallel lines L1 is 2x + y + 1 = 0, L2 is 2x + y + 3 = 0 is equal, so the equation of the straight line L is solved. I don't know what's going on, but I have calculated it several times, which is different from the answer
The line in the middle of two parallel lines, the average of constants 1 and 3 is 2, so the equation is 2x + y + 2 = 0
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