SOLUTION: Quadrilateral- find the value of x. I have tried and tried to work this out and when I plug in my answer it doesnt figure. Please help I would appreciate it. (x+30)+(x-55)+(x-45)+

Question 33519: Quadrilateral- find the value of x. I have tried and tried to work this out and when I plug in my answer it doesnt figure. Please help I would appreciate it.
(x+30)+(x-55)+(x-45)+ x=360 Thank you so very much!!
Answer by Cintchr(481) (Show Source): You can put this solution on YOUR website!

Combine like terms

Add 70 to both sides

I reduced the improper fraction to make it easier to work.

CHECK:

Use this to plug back in

Add the fractions

Reduce the fraction

Add and subtract left to right

YES!!!
So X DOES = 215/2 or 107.5 degrees

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