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⇔ 5x-20<3x+6-4
⇔ 5x-20<3x+12
⇔ 5x-3x<2+20
⇔ 2x < 22
⇔ x < 22
2
⇔ x < 11
(B) 2x +6≥ 1 x-5 (dikali12)
3 4
(2x.12)+(6.12)≥( 1x.12)-(5.12)
3 4
⇔ 8x + 72 ≥ 3x -60
⇔ 8x -3x ≥ -60 - 72
⇔ 5x ≥ -132
5
⇔ x ≥ -26,4
sory klok slh