Open your Windows 7 Math Input Panel, write down your equation and by clicking “insert” you will get the equation in LateX.

Open Math Input Panel |

Select in the Toolbar how to insert the equation at the cursor position:

Align | Inserts \begin{align} equation \end{align} |

Array | Inserts \begin{eqnarray} equation \end{eqnarray} |

Text | Inserts $ equation $ |

None | Inserts equation |