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x in (-oo:+oo)
x/2-(3*x) = -25 // + 25
x/2-(3*x)+25 = 0
x/2-3*x+25 = 0
25-5/2*x = 0 // - 25
-5/2*x = -25 // : -5/2
x = -25/(-5/2)
x = 10
x = 10
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