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x in (-oo:+oo)
x/2-x = 1.25 // - 1.25
x/2-x-1.25 = 0
-1/2*x-1.25 = 0 // + 1.25
-1/2*x = 1.25 // : -1/2
x = 1.25/(-1/2)
x = -2.5
x = -2.5
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