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x in (-oo:+oo)
(15-x)/5 = x-2 // - x-2
(15-x)/5-x+2 = 0
(15-x)/5+(5*(-x))/5+(2*5)/5 = 0
5*(-x)-x+2*5+15 = 0
10-6*x+15 = 0
25-6*x = 0
(25-6*x)/5 = 0
(25-6*x)/5 = 0 // * 5
25-6*x = 0
25-6*x = 0 // - 25
-6*x = -25 // : -6
x = -25/(-6)
x = 25/6
x = 25/6
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