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