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x in (-oo:+oo)
45/225 = x/100 // - x/100
45/225-(x/100) = 0
1/5-1/100*x = 0 // - 1/5
-1/100*x = -1/5 // : -1/100
x = -1/5/(-1/100)
x = 20
x = 20
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