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x in (-oo:+oo)
63/105 = x/100 // - x/100
63/105-(x/100) = 0
3/5-1/100*x = 0 // - 3/5
-1/100*x = -3/5 // : -1/100
x = -3/5/(-1/100)
x = 60
x = 60
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