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x in (-oo:+oo)
1-((5/2)*x) = 16 // - 16
1-((5/2)*x)-16 = 0
(-5/2)*x-16+1 = 0
-5/2*x-15 = 0 // + 15
-5/2*x = 15 // : -5/2
x = 15/(-5/2)
x = -6
x = -6
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