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x in (-oo:+oo)
6 = 5*(1/2)*x // - 5*(1/2)*x
6-(5*(1/2)*x) = 0
(-5/2)*x+6 = 0
6-5/2*x = 0 // - 6
-5/2*x = -6 // : -5/2
x = -6/(-5/2)
x = 12/5
x = 12/5
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