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

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

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