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