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-x≥10-12
-x≥-2
x≤2
7x-21≤15+10x
7x-10x≤15+21
-3x≤36 /:(-3)
x≥-12
- x ≥ 10 - 12
- x ≥ - 2 / * - 1
x ≤ 2
x ∈ ( - ∞ , 2>
7(x - 3) ≤ 5(3 + 2x)
7x - 21 ≤ 15 + 10x
7x - 10x ≤ 15 + 21
- 3x ≤ 36
- x ≤ 36/3
- x ≤ 12 * - 1
x ≥ - 12
x ∈ ,<- 12 , ∞ )