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x in (-oo:+oo)
8 = 40*(x/100) // - 40*(x/100)
8-(40*(x/100)) = 0
(-2/5)*x+8 = 0
8-2/5*x = 0 // - 8
-2/5*x = -8 // : -2/5
x = -8/(-2/5)
x = 20
x = 20
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