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X in (-oo:+oo)
2*(X-15) = X/2 // - X/2
2*(X-15)-(X/2) = 0
2*(X-15)-X/2 = 0
(2^2*(X-15))/2-X/2 = 0
2^2*(X-15)-X = 0
3*X-60 = 0
(3*X-60)/2 = 0
(3*X-60)/2 = 0 // * 2
3*X-60 = 0
3*X-60 = 0 // + 60
3*X = 60 // : 3
X = 60/3
X = 20
X = 20
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