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x in (-oo:+oo)
25*x+80 = 5/2 // - 5/2
25*x-(5/2)+80 = 0
25*x-5/2+80 = 0
25*x+155/2 = 0 // - 155/2
25*x = -155/2 // : 25
x = -155/2/25
x = -31/10
x = -31/10
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