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Identical expressions
x*sign(x) + |x| = zero
x multiply by sign(x) plus module of x| equally 0
x multiply by sign(x) plus module of x| equally zero
xsign(x) + |x| = 0
xsignx + |x| = 0
Similar expressions
x*sign(x) - |x| = 0
x*sign(x) + |x| = 0 equation
+ equation
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