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x in (-oo:+oo)
27/50 = x/100 // - x/100
27/50-(x/100) = 0
27/50-1/100*x = 0 // - 27/50
-1/100*x = -27/50 // : -1/100
x = -27/50/(-1/100)
x = 54
x = 54
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