If i increase my monthly payment then my total interest on a loan will go down? true or false

I would say false

Step-by-step explanation:

the reason why is even though you are paying all of that it might go up or might go down if you keep doing it by  paying

x = -4

step-by-step explanation:

- 20 - 4(x + 3) = 4x

=> -20 - 4x - 12 = 4x

=> - 32 -4x = 4x

=> -32 = 4x + 4x

=> - 32 = 8x

=> -32/8 = x

=> -4 = x