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x in (-oo:+oo)
(1/6)*x+(1/2)*x+x = 240 // - 240
(1/6)*x+(1/2)*x+x-240 = 0
5/3*x-240 = 0 // + 240
5/3*x = 240 // : 5/3
x = 240/5/3
x = 144
x = 144
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