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x in (-oo:+oo)
(1-x)/2-((x-1)/5) = 3 // - 3
(1-x)/2-((x-1)/5)-3 = 0
(1-x)/2+(-1*(x-1))/5-3 = 0
(5*(1-x))/(2*5)+(-1*2*(x-1))/(2*5)+(-3*2*5)/(2*5) = 0
5*(1-x)-1*2*(x-1)-3*2*5 = 0
7-7*x-30 = 0
-7*x-23 = 0
(-7*x-23)/(2*5) = 0
(-7*x-23)/(2*5) = 0 // * 2*5
-7*x-23 = 0
-7*x-23 = 0 // + 23
-7*x = 23 // : -7
x = 23/(-7)
x = -23/7
x = -23/7
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