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x in (-oo:+oo)
7/8 = x/28 // - x/28
7/8-(x/28) = 0
7/8-1/28*x = 0 // - 7/8
-1/28*x = -7/8 // : -1/28
x = -7/8/(-1/28)
x = 49/2
x = 49/2
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