4. a)7a +2,875 < 59,343
7a<59,343-2,875
7a<56,468
a<56,468:7
a<8,06
a∈{0,1,2,3,4,5,6,7}
b)11u+2,3≥15
11u≥15-2,3
11u≥12,7
u≥12,7:11
u≥1,15
u∈{1,2,3,4,....}
c)79,32+17t<100
17t<100-79,32
17t<20,68
t<20,68:17
t<1,21
t∈{0}
d)1,5-14v>0
14v>0+1,5
14v>1,5
v>1,5:14
v>0,10
v∈{1,2,3,4,5,6,7,...}
e)87,87-23a>5
23a>5+87,87
23a>92,87
a>92,87:23
a>4,03
a∈{5,6,7,8,9,.....}
f)5,43-2t≤4,92
2t≤4,92+5,43
2t≤10,35
t≤10,35:2
t≤5,17
t∈{0,1,2,3,4,5}
