Question

решите x+1≤9
2)x+30≥5
3)2x+7≤11
4)4x+5≤21
5)9x-7≥-25

Answer 1

3) 2x<7+11
2x=18
x=18:2
x=9
4) 4x<5+21
4x=26
x=26:4
x=6.5