Mathematics Homework Help

Mathematics Homework Help. Please write and equation for this problem involving a triangle

Find the angles. The greatest angle of the triangle is 5 times as great as the least angle. The third angle is 18 degrees less than the greatest angle how many degrees aRe in each of the angles of the triangle?  I know the angles  18, 90, 72 but I can,t figure out how to write an equation. I did the guess and try approach but need an equation for proof. 

Mathematics Homework Help

 
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