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x in (-oo:+oo)
4-((4/5)*x) = 16 // - 16
4-((4/5)*x)-16 = 0
(-4/5)*x-16+4 = 0
-4/5*x-12 = 0 // + 12
-4/5*x = 12 // : -4/5
x = 12/(-4/5)
x = -15
x = -15
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