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x^2-x^2+4x-4x+4x-2x=-16+4
2x=-12/:2
x=-6
15x+3≥3x - 6(x-2)
15x+3≥3x - 6x- 12
15x- 3x +6x ≥ -12 -3
18x≥-15 /: 18