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x in (-oo:+oo)
12 = 100*(x/200) // - 100*(x/200)
12-(100*(x/200)) = 0
(-1/2)*x+12 = 0
12-1/2*x = 0 // - 12
-1/2*x = -12 // : -1/2
x = -12/(-1/2)
x = 24
x = 24
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