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c in (-oo:+oo)
60 = 0.15*((1000*c)/10) // - 0.15*((1000*c)/10)
60-(0.15*((1000*c)/10)) = 0
60-15*c = 0
60-15*c = 0 // - 60
-15*c = -60 // : -15
c = -60/(-15)
c = 4
c = 4
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