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x in (-oo:+oo)
16/64 = x/100 // - x/100
16/64-(x/100) = 0
1/4-1/100*x = 0 // - 1/4
-1/100*x = -1/4 // : -1/100
x = -1/4/(-1/100)
x = 25
x = 25
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