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x in (-oo:+oo)
100 = (5/100)*x // - (5/100)*x
100-((5/100)*x) = 0
(-1/20)*x+100 = 0
100-1/20*x = 0 // - 100
-1/20*x = -100 // : -1/20
x = -100/(-1/20)
x = 2000
x = 2000
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