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1 - 4 x ≥ 5

- 4 x ≥ 5 - 1

- 4 x ≥ 4

x ≤ - 1

] - ∞ ; - 1 ]

2 x + 5 ≤ 7 x - 1

2 x - 7 x ≤ - 1 - 5

- 5 x ≤  6

x ≥ - 6/5

[ - 6./5 ; + ∞ [

( t + 3 ) / 2  < ( t + 1 ) / 3

( 3 t + 9 ) / 6 < ( 2 t + 2 ) / 6

3 t + 9 < 2 t + 2

3 t - 2 t < 2 - 9

t < - 7

] - ∞ ; - 7 [

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