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x in (-oo:+oo)
6*(10-5*x) = -180 // + 180
6*(10-5*x)+180 = 0
6*(10-5*x)+180 = 0
240-30*x = 0
240-30*x = 0
240-30*x = 0 // - 240
-30*x = -240 // : -30
x = -240/(-30)
x = 8
x = 8
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