A number increased by thirteen
A number reduced by eight
x-7
Seven less than a number
Fifteen split into three groups
x+13
Three groups of nine
Twelve shared among four groups
Twenty minus a number
12÷4
11+(-x)
20-x
3(9)
Two groups of negative four
15÷3
Eleven plus a negative number
A number plus fourteen
x+14
x-8
2(-4)
