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x in (-oo:+oo)
(1/5)*x > 30 // - 30
(1/5)*x-30 > 0
1/5*x-30 > 0 // + 30
1/5*x > 30 // : 1/5
x > 30/1/5
x > 150
x in (150:+oo)
(150:+oo)
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