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x in (-oo:+oo)
-((2/5)*x) = 16 // - 16
-((2/5)*x)-16 = 0
(-2/5)*x-16 = 0
-2/5*x-16 = 0 // + 16
-2/5*x = 16 // : -2/5
x = 16/(-2/5)
x = -40
x = -40
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