Question

Given circles are the answers but how they solve step by step by step answer it, I can choose you as brainiest. don't write wrong answer ​

Answer 1

Step-by-step explanation:

1] 7x = 20 - x

   7x + x = 20

   8x = 20

     x = 20/8 = 10/4 = 5/2

2] 15 - 4x = 7

    15 - 7 = 4x

     8 = 4x

     8/4 = x

     2 = x

3] (5x + 4)/(2x + 1) = 2

    5x + 4 = 2(2x + 1)

    5x + 4 = 4x + 2

    5x - 4x = 2 - 4

              x = - 2