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x in (-oo:+oo)
(I/2)*x+13 = 25 // - 25
(I/2)*x-25+13 = 0
1/2*I*x-12 = 0 // + 12
1/2*I*x = 12 // : 1/2*I
x = 12/(1/2*I)
x = 24*I^-1
x = 24*I^-1
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