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X in (-oo:+oo)

6/8 = X/28 / - X/28

6/8-(X/28) = 0

3/4-1/28*X = 0 / - 3/4

-1/28*X = -3/4 / : -1/28

X = -3/4/(-1/28)

X = 21

X = 21

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