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x in (-oo:+oo)
(1/2)*x-4 > -6 // + 6
(1/2)*x-4+6 > 0
1/2*x+2 > 0 // - 2
1/2*x > -2 // : 1/2
x > -2/1/2
x > -4
x in (-4:+oo)
(-4:+oo)
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