Side a = 23 Side b = 28 Side c =46
First set up your equation witch is x-5+x+x-5*2=69
Then Simplify x+-5+x+x+-10=69
Then combine like terms 3x-15=69
Add 15 to both sides
After you will get 3x=84
then divide both sides by 3
You will get x=28
Then go back to your question it says THE FIRST IS 5 CM SHORTER THAN THE SECOND SIDE. THE THIRD SIDE IS TWICE AS LONG AS THE FIRST SIDE. So that tells you that to find A, you do 28-5=23, to side b is x so its 28, and to find side c you do 28-5*2=46. So A=23, B=28, and C=46.
add an image !
the equivalent expression are always the hardest ones but you look at the gcf also