This is a two-step equation.
Step 1: Get rid of the constant term on the side with the variable. Since 7 is being subtracted from 3m, add 7 to both sides:
3m - 7 + 7 = 14 + 7
3m = 21
Step 2: Isolate m. Since m is being multiplied by 3, divide both sides by 3:
3m / 3 = 21 / 3
m = 7
So, the value of m is 7.