21/7 + 3/7(3x - 5) = -4
21/7 + 9/7x - 15/7 = -4.....multiply everything by 7
21 + 9x - 15 = - 28
9x + 6 = -28
9x = -28 - 6
9x = - 34
x = -34/9 or - 3 7/9
Answer:
Step-by-step explanation:
6/5.
I don't think a number like that exists :/

Step-by-step explanation:
- We expand
using algebraic identity 
Hi there!
The perimeter of any square is the side of the square multiplied by four.
Perimeter= 4 x (5x-2)
Then distribute the four over parentheses.
Perimeter= 4(5x)-4(2)
Perimeter= 20x-8
Hope this helps :)