using the LCD method.... well, there are a couple of ways, but let's simply add them up.
well, the denominators are 5x and 2x... so the only LCD will just be 10x, since it's divisible by both, so let's use that one.
List four numbers when counting backwards in steps of seven
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H is the answer
and the line of the symmetry is like the picture
and the line of the symmetry is like the picture