"The sum of a number and 5."
x+5
"Three times a number increased by 7."
3x+7
"The product of 4 and the sum of a number and 3."
4(x+3)
"The sum of a number and 8 is 20."
x+8=20
"A number increased by 9 is 15."
x+9=15
"Ten more than a number."
x+10
"The quotient of a number and 9."
x/9
"Seven less than twice a number."
2x−7
"Twice a number is equal to 18."
2x=18
"Twice a number is 24."
2x=24
"The difference of a number and 8."
x−8
"The product of 5 and a number."
5x
"The quotient of the difference of a number and 5 by 2."
(x-5)/2
"Five less than a number is 12."
x−5=12
"Seven less than a number is 11."
x−7=11
"Four less than a number."
x−4
"The square of a number."
x2
"Five times the square of a number."
5x2
"Three times a number increased by 4 is 25."
3x+4=25
"Three times a number increased by 2 is 20."
3x+2=20
"Twice a number."
2x
"Half of a number decreased by 6."
2/x−6
"Three more than the cube of a number."
x3+3
"The quotient of a number and 6 is 9."
x/6=9
"Five more than twice a number is 21."
2x+5=21