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2(x-3)+1 ≤ 3(2x+6)-3
2x-6+1 ≤ 6x+18-3
2x-5 ≤ 6x+15
-5-15 ≤ 6x-2x
-20 ≤ 4x
-20/4 ≤ x
-5 ≤ x
bilangan bulat yang lebih dari atau sama dengan -5
x = (-5,-4,-3,-2,-1,0,1,2,3...)