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x in (-oo:+oo)
(1-(1/3)-(2/5))*x = 320 // - 320
(1-(1/3)-(2/5))*x-320 = 0
(1-1/3-2/5)*x-320 = 0
4/15*x-320 = 0 // + 320
4/15*x = 320 // : 4/15
x = 320/4/15
x = 1200
x = 1200
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