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x in (-oo:+oo)
5 = 100*(x/120) // - 100*(x/120)
5-(100*(x/120)) = 0
(-5/6)*x+5 = 0
5-5/6*x = 0 // - 5
-5/6*x = -5 // : -5/6
x = -5/(-5/6)
x = 6
x = 6
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