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x in (-oo:+oo)
-75 = (i/2)*x // - (i/2)*x
-((i/2)*x)-75 = 0
-1/2*i*x-75 = 0 // + 75
-1/2*i*x = 75 // : -1/2*i
x = 75/(-1/2*i)
x = -150*i^-1
x = -150*i^-1
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