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x in (-oo:+oo)
(4*(5-(2*x)))/5 = x/1 // - x/1
(4*(5-(2*x)))/5-(x/1) = 0
(4*(5-2*x))/5-x = 0
(4*(5-2*x))/5+(5*(-x))/5 = 0
4*(5-2*x)+5*(-x) = 0
20-13*x = 0
(20-13*x)/5 = 0
(20-13*x)/5 = 0 // * 5
20-13*x = 0
20-13*x = 0 // - 20
-13*x = -20 // : -13
x = -20/(-13)
x = 20/13
x = 20/13
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