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x in (-oo:+oo)
(x-10)/20+x/30 = 1 // - 1
(x-10)/20+x/30-1 = 0
(30*(x-10))/(20*30)+(20*x)/(20*30)+(-1*20*30)/(20*30) = 0
30*(x-10)+20*x-1*20*30 = 0
50*x-600-300 = 0
50*x-900 = 0
(50*x-900)/(20*30) = 0
(50*x-900)/(20*30) = 0 // * 20*30
50*x-900 = 0
50*x-900 = 0 // + 900
50*x = 900 // : 50
x = 900/50
x = 18
x = 18
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