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x in (-oo:+oo)
(1/2)*(4*x-6) > 18 // - 18
(1/2)*(4*x-6)-18 > 0
1/2*(4*x-6)-18 > 0
1/2*(4*x-6)-18 > 0
2*x-21 > 0
2*x-21 > 0
2*x-21 > 0 // + 21
2*x > 21 // : 2
x > 21/2
(-oo:21/2) (21/2:+oo) 2*x-21 - +
x in (21/2:+oo)
(21/2:+oo)
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