PS!

... - 4 (7a + 5) = - 160

4 (7a + 5) = - 160

mutiply the bracket by 4

(4) (7a) (4) (+5) = - 160

28a+20 = - 160

move + 20 to the other side

sign changes from + 20 to - 20.

28a+20-20 = - 160-20

28a = - 180

Divide by 28

28a/28 = - 180/28

x = - 180/28

reduce by dividing 4

-180/4 = - 45

28/4 = 7

-45/7 or - 6 3/7

Answer : x = - 45/7, x = - 6 3/7