You're more likely to get help sooner if you FOLLOW DIRECTIONS and put the subject in the School Subject box.
In this case, you should put one of these, and the more specific, the better:
Math
Algebra 1
(or whatever the NAME of the class is that you're taking)
What is 5x+6x+7x=31,050
solve for X
X is 1725
I'm lost where and how did they get 1725 for X
2 answers
4x + 6x + 7x = 18x
18x = 31,050
Divide both sides of the equation by 18.
18x = 31,050
Divide both sides of the equation by 18.