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x in (-oo:+oo)
x = ((-4*a)^1)/2 // - ((-4*a)^1)/2
x-(((-4*a)^1)/2) = 0
2*a+x = 0
2*a+x = 0 // - 2*a
x = -(2*a)
x = -2*a
x = -2*a
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