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x in (-oo:+oo)
x/(-3) <= -70 // + 70
x/(-3)+70 <= 0
70-1/3*x <= 0 // - 70
-1/3*x <= -70 // : -1/3
x >= -70/(-1/3)
x >= 210
x in <210:+oo)
<210:+oo)
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