#2**+1 **

\(?=63\)

This is your original equation. I'll replace your question mark with an x instead:

\(23-46=40-x\)

Now, solve by isolating x:

\(23-46=40-x\) | Simplify the left hand side of the equation |

\(-23=40-x\) | Subtract 40 on both sides |

\(-63=-x\) | Multiply by -1 on both sides |

\(x=63\) | |

x=63 is your final answer.

TheXSquaredFactor May 23, 2017