4. Four times a certain number decreased by 5.
C. 4x = 5
a. 4x-5
b. 4x+5
5. Three subtracted from five times a number
c. 5x=3
a 5x-3
b. 5x+3
6. The sum of four times and two.
c. 2=4x
a. 2 + 4x
b. 2-4x
7. A certain number decreased by seven.
2.
c. x=7
b. X+7 7​