No Mathematical Operators Can Phase Me!

Algebra Level 1

y+y=yyy=yy×y=yy÷y=y\large{ \begin{aligned} y \color{#3D99F6} + y &=& y \\ y \color{#D61F06} - y &=& y \\ y \color{#20A900} \times y &=& y \\ y \color{#69047E} \div y &=& y \end{aligned}}

What number(s) satisfy all the four equations above?

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