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x in (-oo:+oo)
x/5 > -3/10 // + -3/10
x/5-(-3/10) > 0
x/5+3/10 > 0
1/5*x+3/10 > 0 // - 3/10
1/5*x > -3/10 // : 1/5
x > -3/10/1/5
x > -3/2
x in (-3/2:+oo)
(-3/2:+oo)
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