5x - 2
Five times a number (5x) decreased (-) by two (2)
2x + 5
Twice a number (2x) increased (+) by seven (7)
7x + 2
Two more (+2) than the product of a number and 7 (7x)
2x - 5
The difference (-) of two times of number (2x) and five (5)
2x + 7
Twice a number (2x) increased by seven (+7)