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x in (-oo:+oo)
(1/4)*x-7 > 3 // - 3
(1/4)*x-7-3 > 0
1/4*x-10 > 0 // + 10
1/4*x > 10 // : 1/4
x > 10/1/4
x > 40
x in (40:+oo)
(40:+oo)
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