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x in (-oo:+oo)
a/2+x = a/b // - a/b
a/2-(a/b)+x = 0
1/2*a-(a*b^-1)+x = 0 // - 1/2*a-(a*b^-1)
x = -(1/2*a-(a*b^-1))
x = a*b^-1-(1/2*a)
x = a*b^-1-(1/2*a)
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