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x in (-oo:+oo)
-16 = (8/5)*x // - (8/5)*x
-((8/5)*x)-16 = 0
(-8/5)*x-16 = 0
-8/5*x-16 = 0 // + 16
-8/5*x = 16 // : -8/5
x = 16/(-8/5)
x = -10
x = -10
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