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• Identical expressions

• - two *x + sign(x) = zero
• minus 2 multiply by x plus sign(x) equally 0
• minus two multiply by x plus sign(x) equally zero
• -2x + sign(x) = 0
• -2x + signx = 0

• Similar expressions

• -2*x - sign(x) = 0
• 2*x + sign(x) = 0