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x in (-oo:+oo)
x/5 = 8/(-4) // - 8/(-4)
x/5-(8/(-4)) = 0
x/5+2 = 0
1/5*x+2 = 0 // - 2
1/5*x = -2 // : 1/5
x = -2/1/5
x = -10
x = -10
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