the sum of 5x and 2x is at least 14
The sum of number is at least 14 means the sum is either equal to 14 or greater then 14. So,
According to the question,
5x + 2x ≥ 14
= 7x ≥ 14
= x ≥ 14 / 7
= x ≥ 2
5x + 2x = AT LEAST 14
Which means 7x is at least 14
So if we divide both sides by 7
x is at least 2
which means it is 2 at its lowest value but could also be higher
-> we write this as greater than or equal to 2
x ≥ 2