If the sum of a number and 6 is tripled, the result is one less than twice the number ? what is x?

Well 6 is tripled so write a expression/phrase.
3(x + 6)
The result is one less than twice the number.
2x - 1
Put it all together to make an equation and solve.
3(x + 6) = 2x - 1
3x + 18 = 2x - 1
3x - 2x = -1 - 18
x = -19
Check to make sure it works.
3(-19 + 6) = 2(-19) - 1
3(-13) = -38 - 1
-39 = -39 < The equality confirms our solution of x = -19
Hope this helps!