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10x-15-6 ≥ 12x-9
10x-12x ≥ -9+15+6
-2x ≥ 12 /:-2
x <I -6
b) -0,2(5x-3) ≤ x -0,1
-1x+0,6 ≤ x - 0,1
-1x-x ≤ -0,1-0,6
-2x ≤ -0,7 /:-2
x >I -7/10 : -2/1
x >I 0,35