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x in (-oo:+oo)
x/5-3 < 7 // - 7
x/5-7-3 < 0
1/5*x-10 < 0 // + 10
1/5*x < 10 // : 1/5
x < 10/1/5
x < 50
x in (-oo:50)
(-oo:50)
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