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b) -0,2(5x-3)≤x-0,1
a) 10x-15-6≥12x-9
10x-21≥12x-9
10x-12x≥-9+21
-2x≥12 |/(-2)
x≤12
b) -x+0,6≤x-0,1
-x-x≤-0,1-0,7
-2x≤-0,8
x≥0,4
10x-15-6x≥12x-9
4x-15≥12x-9
-6≥8x
-3/4≥x
-0,2(5x-3)≤x-0,1
-x+0,6≤x-0,1
0,7≤2x
0,35≤x
4x-15≥12x-9/-4x
-15≥8x-9/+9
-6≥8x/:8
x≤-0,75
-x+0,6≤x-0,1/*10
-10x+6≤10x-1/+10x
6≤20x-1/:20
x≥0,35