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