Question

Ce relatie exista intre numerele intregi x si y, daca x - y = - (x - y) ?

Answer 1

x-y=-(x-y)⇔x-y=y-x⇔2x=2y⇒x=y

Answer 2

[tex]x-y=-(x-y)\ \textless \ =\ \textgreater \ x-y=-x+y \\ x-y+x-y=0 \\ 2x-2y=0 \\ 2x=2y=\ \textgreater \ x=y[/tex]