3 (x-7) + 8=-20

can someone explain how to do this step by step

3 (x-7) + 8=-20

Multiply the bracket by 3

(3) (x) (3 (-7) + 8 = - 20

3x-21+8 = - 20

3x-13 = - 20

Move - 13 to the other side. Sign changes from - 13 to + 13.

3x-13+13 = - 20+13

3x = - 7

Divide by 3

3x/3 = - 7/3

x = - 7/3 or in mixed number : - 2 1/3

Answer : x = - 7/3 or in mixed number : - 2 1/3

3x₋21₊8≈20

3x₋13≈20

3x≈7

x≈7:3