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18 - 9x ≤ -12x + 42
-9x + 12x ≤ 42 - 18
3x ≤ 24 / : 3
x ≤ 8
6-3x<-4x+14
-3x+4x<14-6
x<8
18-9x≤-12+42
-9x+12x≤42-18
3x≤24/:3
x≤8
Mam nadzieję ,że pomogłam ;)