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10x - 15 - 6 ≥ 12x - 9
10x - 12x ≥ 15 + 6 - 9
-2x ≥ 12 //: -2
x ≤ -6
b) -0,2(5x-3) ≤ x -0,1
-1 + 0,6 ≤ x - 0,1
x ≤ 1 - 0,6 - 0,1
x ≤ 0,3
10x-15-6=12x-9
10x-12x=-9+15+6
-2x=12/(-2)
x=-6