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