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x in (-oo:+oo)
5*x-(1/2) = -51/2 // + -51/2
5*x-(1/2)-(-51/2) = 0
5*x-1/2+51/2 = 0
5*x+25 = 0 // - 25
5*x = -25 // : 5
x = -25/5
x = -5
x = -5
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