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x in (-oo:+oo)
(5-(2*x))/6 = 20 // - 20
(5-(2*x))/6-20 = 0
(5-2*x)/6-20 = 0
(5-2*x)/6+(-20*6)/6 = 0
5-2*x-20*6 = 0
-2*x-115 = 0
(-2*x-115)/6 = 0
(-2*x-115)/6 = 0 // * 6
-2*x-115 = 0
-2*x-115 = 0 // + 115
-2*x = 115 // : -2
x = 115/(-2)
x = -115/2
x = -115/2
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