решить неравенства СРОЧНО КОПЕЦ КАК НАДО

1. 2+х≻7-х
2. 5(х-2)-х≺ 2
3. х²+3х-4≤ 0
1)
1) 4+7х≺18
2) 9х-4(2х+1)≻-8
3) 6х-7≤8х-9
4) х²-4х-12≥0
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