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