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x in (-oo:+oo)
-7/4 = x/8 // - x/8
-(x/8)-7/4 = 0
-1/8*x-7/4 = 0 // + 7/4
-1/8*x = 7/4 // : -1/8
x = 7/4/(-1/8)
x = -14
x = -14
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