75<-5(4x+1)
Multiply the number outside of the parenthesis(-5) with the numbers inside the parenthesis(4x and 1)
75<-20x-5
Add 5 to both sides so that it cancels out
80<-20x
Divide both sides by -20 so that only x is the only variable on one side. Also flip the greater than/less than sign because you are dividing by a negative number.
Your final answer should be: -16>x