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x in (-oo:+oo)
600 = (60/100)*x // - (60/100)*x
600-((60/100)*x) = 0
(-3/5)*x+600 = 0
600-3/5*x = 0 // - 600
-3/5*x = -600 // : -3/5
x = -600/(-3/5)
x = 1000
x = 1000
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