To get rid of the parantheses we must multiply -4 times anything inside the parantheses.
-4(7x+5)=-160
-28x-20=-160
Add 20 to both sides of the equation.
-28x-20=-160
-28x=-140
Divide both sides by -28
-28x/-28=-140/-28
x=5
Our final answer is 5
Hope this helps!