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x in (-oo:+oo)
9/(-4) = x/8 // - x/8
9/(-4)-(x/8) = 0
-1/8*x-9/4 = 0 // + 9/4
-1/8*x = 9/4 // : -1/8
x = 9/4/(-1/8)
x = -18
x = -18
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