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x in (-oo:+oo)
0.5 = 100*(x/60) // - 100*(x/60)
0.5-(100*(x/60)) = 0
(-5/3)*x+0.5 = 0
0.5-5/3*x = 0 // - 0.5
-5/3*x = -0.5 // : -5/3
x = -0.5/(-5/3)
x = 0.3
x = 0.3
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