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= (2*i + 5-3 ) / (-6 + 4*i + 2) =
= (2*i + 2) / (4*i - 4) =
= [2*(i + 1)] / [2*(2*i - 2)] =
= (i + 1) / (2*i - 2) =
= [(i + 1)*(2*i + 2)] / [(2*i + 2)*(2*i - 2)] =
= (-2 + 2*i + 2*i + 2) / (-4 - 4) =
= (4*i) / (-8) =
= -i/2