7x - 1 + 6x - 1 = 180
13x - 2 = 180
13x = 182
x = 14
Forgive me if this is wrong. I haven't done stat in a year, but comment if you need clarification!
Hello there!
To find the GCF, we must list all the factors and then just spot the greatest factor.
28: 1, 2, 4, 7, 14, 28.
210 1, 2, 3, 5, 6, 7, 10, 14, 15, 21, 30, 35, 42, 70.
So 14 is the GCF. Hope this helps you!
~Just a felicitous girlie
#HaveAnAwesomeDay

It is a i think sorry if wrong