Question 467091
first draw a triangle and label each side with the information given... two sides are going to be just x because the have the same length... the other side is going to be (x+7).. the perimeter is the addition of the three sides...

the equation will look as follows:

{{{ x+x+(x+7)=67 }}} by simplifying we obtain {{{ 3x+7=67 }}} then 
{{{ 3x=60 and x =20}}}  so the length of the three sides areas follows:

20 20 and 27.