7x < 4x - 12 heeelllllllllllllllllllllllllpppppppppppppppppppppppppp mmmmmmmmmmeeeeeeeeeeeeeeeeeeeee

7x < 4x - 12 subtract 4x from both sides

3x < -12 divide both sides by 3

3 < - 4

Sorry! The above is typo. It should read:

x < - 4