n increased by 5.2 is equal to 13
Let's convert the english into mathspeak.
n increased by 5.2: we can write this as, n + 5.2
equal to 13: we can write this as, = 13
Putting the two writings together,
n + 5.2 = 13
now subtract 5.2 from both sides.
n + 5.2 - 5.2 = 13 - 5.2
now do the math ( I mean do the arithmetic/add the numbers)
n = 7.8
Answer: n = 7.8