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x in (-oo:+oo)
(1-x)/5 = (x-2)/10 // - (x-2)/10
(1-x)/5-((x-2)/10) = 0
(1-x)/5+(-1*(x-2))/10 = 0
(10*(1-x))/(5*10)+(-1*5*(x-2))/(5*10) = 0
10*(1-x)-1*5*(x-2) = 0
20-15*x = 0
(20-15*x)/(5*10) = 0
(20-15*x)/(5*10) = 0 // * 5*10
20-15*x = 0
20-15*x = 0 // - 20
-15*x = -20 // : -15
x = -20/(-15)
x = 4/3
x = 4/3
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