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x in (-oo:+oo)
x/(-4) = 8-1 // - 8-1
x/(-4)-8+1 = 0
-1/4*x-7 = 0 // + 7
-1/4*x = 7 // : -1/4
x = 7/(-1/4)
x = -28
x = -28
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