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t in (-oo:+oo)
t/6 < -7 // + 7
t/6+7 < 0
1/6*t+7 < 0 // - 7
1/6*t < -7 // : 1/6
t < -7/1/6
t < -42
t in (-oo:-42)
(-oo:-42)
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